Fix a variety of memory leaks

This patch addresses a number of memory leaks in a variety of modules that were
found by a static analysis tool.  A brief summary of the changes:

* app_minivm:       free ast_str objects on off nominal paths
* app_page:         free the ast_dial object if the requested channel technology
                    cannot be appended to the dialing structure
* app_queue:        if a penalty rule failed to match any existing rule list
                    names, the created rule would not be inserted and its memory
                    would be leaked
* app_read:         dispose of the created silence detector in the presence of
                    off nominal circumstances
* app_voicemail:    dispose of an allocated unique ID field for MWI event
                    un-subscribe requests in off nominal paths; dispose of
                    configuration objects when using the secret.conf option
* chan_dahdi:       dispose of the allocated frame produced by ast_dsp_process
* chan_iax2:        properly unref peer in CLI command "iax2 unregister"
* chan_sip:         dispose of the allocated frame produced by sip_rtp_read's
                    call of ast_dsp_process; free memory in parse unit tests
* func_dialgroup:   properly deref ao2 object grhead in nominal path of
                    dialgroup_read
* func_odbc:        free resultset in off nominal paths of odbc_read
* cli:              free match_list in off nominal paths of CLI match completion
* config:           free comment_buffer/list_buffer when configuration file load
                    is unchanged; free the same buffers any time they were
                    created and config files were processed
* data:             free XML nodes in various places
* enum:             free context buffer in off nominal paths
* features:         free ast_call_feature in off nominal paths of applicationmap
                    config processing
* netsock2:         users of ast_sockaddr_resolve pass in an ast_sockaddr struct
                    that is allocated by the method.  Failures in
                    ast_sockaddr_resolve could result in the users of the method
                    not knowing whether or not the buffer was allocated.  The
                    method will now not allocate the ast_sockaddr struct if it
                    will return failure.
* pbx:              cleanup hash table traversals in off nominal paths; free
                    ignore pattern buffer if it already exists for the specified
                    context
* xmldoc:           cleanup various nodes when we no longer need them
* main/editline:    various cleanup of pointers not being freed before being
                    assigned to other memory, cleanup along off nominal paths
* menuselect/mxml:  cleanup of value buffer for an attribute when that attribute
                    did not specify a value
* res_calendar*:    responses are allocated via the various *_request method
                    returns and should not be allocated in the various
                    write_event methods; ensure attendee buffer is freed if no
                    data exists in the parsed node; ensure that calendar objects
                    are de-ref'd appropriately
* res_jabber:       free buffer in off nominal path
* res_musiconhold:  close the DIR* object in off nominal paths
* res_rtp_asterisk: if we run out of ports, close the rtp socket object and free
                    the rtp object
* res_srtp:         if we fail to create the session in libsrtp, destroy the
                    temporary ast_srtp object

(issue ASTERISK-19665)
Reported by: Matt Jordan

Review: https://reviewboard.asterisk.org/r/1922
........

Merged revisions 366880 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 366881 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@366917 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/editline/readline.c

@@ -549,6 +549,7 @@ _history_expand_command(const char *command, size_t cmdlen, char **result)
 						from = strdup(search);
 					else {
 						from = NULL;
+						free(line);
 						return (-1);
 					}
 				}
@@ -609,8 +610,13 @@ _history_expand_command(const char *command, size_t cmdlen, char **result)
 		end = max - ((end < -1) ? 1 : 0);
 
 	/* check boundaries ... */
-	if (start > max || end > max || start > end)
+	if (start > max || end > max || start > end) {
+		for (i = 0; i <= max; i++) {
+			free(arr[i]);
+		}
+		free(arr), arr = (char **) NULL;
 		return (-1);
+	}
 
 	for (i = 0; i <= max; i++) {
 		char *temp;

main/editline/term.c

@@ -472,7 +472,7 @@ term_rebuffer_display(EditLine *el)
 private int
 term_alloc_display(EditLine *el)
 {
-	int i;
+	int i, j;
 	char **b;
 	coord_t *c = &el->el_term.t_size;
 
@@ -481,8 +481,13 @@ term_alloc_display(EditLine *el)
 		return (-1);
 	for (i = 0; i < c->v; i++) {
 		b[i] = (char *) el_malloc((size_t) (sizeof(char) * (c->h + 1)));
-		if (b[i] == NULL)
+		if (b[i] == NULL) {
+			for (j = 0; j < i; j++) {
+				el_free(b[j]);
+			}
+			el_free(b);
 			return (-1);
+		}
 	}
 	b[c->v] = NULL;
 	el->el_display = b;
@@ -492,8 +497,13 @@ term_alloc_display(EditLine *el)
 		return (-1);
 	for (i = 0; i < c->v; i++) {
 		b[i] = (char *) el_malloc((size_t) (sizeof(char) * (c->h + 1)));
-		if (b[i] == NULL)
+		if (b[i] == NULL) {
+			for (j = 0; j < i; j++) {
+				el_free(b[j]);
+			}
+			el_free(b);
 			return (-1);
+		}
 	}
 	b[c->v] = NULL;
 	el->el_vdisplay = b;

main/editline/tokenizer.c

@@ -113,12 +113,17 @@ tok_init(const char *ifs)
 	tok->argc = 0;
 	tok->amax = AINCR;
 	tok->argv = (char **) tok_malloc(sizeof(char *) * tok->amax);
-	if (tok->argv == NULL)
+	if (tok->argv == NULL) {
+		tok_free(tok);
 		return (NULL);
+	}
 	tok->argv[0] = NULL;
 	tok->wspace = (char *) tok_malloc(WINCR);
-	if (tok->wspace == NULL)
+	if (tok->wspace == NULL) {
+		tok_free(tok->argv);
+		tok_free(tok);
 		return (NULL);
+	}
 	tok->wmax = tok->wspace + WINCR;
 	tok->wstart = tok->wspace;
 	tok->wptr = tok->wspace;