assigned-uniqueids: Miscellaneous cleanup and fixes.

* Fix memory leak in ast_unreal_new_channels().  Made it generate the ;2
uniqueid on a stack variable instead of mallocing it.

* Made send error response to ARI and AMI requests instead of just logging
excessive uniqueid length and allowing truncation.  action_originate() and
ari_channels_handle_originate_with_id().

* Fixed minor truncating uniqueid hole when generating the ;2 uniqueid
string length.  Created public and internal lengths of uniqueid.  The
internal length can handle a max public uniqueid plus an appended ;2.

* free() and ast_free() are NULL tolerant so they don't need a NULL test
before calling.

* Made use better struct initialization format instead of the position
dependent initialization format.  Also anything not explicitly initialized
in the struct is initialized to zero by the compiler.

* Made ast_channel_internal_set_fake_ids() use the safer
ast_copy_string() instead of strncpy().

Review: https://reviewboard.asterisk.org/r/3371/
........

Merged revisions 410949 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@410950 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/rtp_engine.h

@@ -86,11 +86,14 @@ extern "C" {
 /* Maximum number of generations */
 #define AST_RED_MAX_GENERATION 5
 
-/* Maximum size of an Asterisk channel unique ID. Should match AST_MAX_UNIQUEID.
- * Note that we don't use that defined value directly here to avoid a hard dependency
- * on channel.h
+/*!
+ * Maximum size of an internal Asterisk channel unique ID.
+ *
+ * \note Must match the AST_MAX_UNIQUEID(AST_MAX_PUBLIC_UNIQUEID) value.
+ * We don't use that defined value directly here to avoid a hard
+ * dependency on channel.h.
  */
-#define MAX_CHANNEL_ID 150
+#define MAX_CHANNEL_ID 152
 
 struct ast_rtp_instance;
 struct ast_rtp_glue;