Fix memory corruption when trying to get "core show locks".

Review https://reviewboard.asterisk.org/r/2580/ tried to fix the mismatch
in memory pools but had a math error determining the buffer size and
didn't address other similar memory pool mismatches.

* Effectively reverted the previous patch to go in the same direction as
trunk for the returned memory pool of ast_bt_get_symbols().

* Fixed memory leak in ast_bt_get_symbols() when BETTER_BACKTRACES is
defined.

* Fixed some formatting in ast_bt_get_symbols().

* Fixed sig_pri.c freeing memory allocated by libpri when MALLOC_DEBUG is
enabled.

* Fixed __dump_backtrace() freeing memory from ast_bt_get_symbols() when
MALLOC_DEBUG is enabled.

* Moved __dump_backtrace() because of compile issues with the utils
directory.

(closes issue ASTERISK-22221)
Reported by: Matt Jordan

Review: https://reviewboard.asterisk.org/r/2778/
........

Merged revisions 397525 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 397528 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@397570 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/utils.h

@@ -465,24 +465,20 @@ long int ast_random(void);
  */
 #define ast_random_double() (((double)ast_random()) / RAND_MAX)
 
+#ifndef __AST_DEBUG_MALLOC
+#define ast_std_malloc malloc
+#define ast_std_calloc calloc
+#define ast_std_realloc realloc
+#define ast_std_free free
+
 /*!
  * \brief free() wrapper
  *
  * ast_free_ptr should be used when a function pointer for free() needs to be passed
  * as the argument to a function. Otherwise, astmm will cause seg faults.
  */
-#ifdef __AST_DEBUG_MALLOC
-static void ast_free_ptr(void *ptr) attribute_unused;
-static void ast_free_ptr(void *ptr)
-{
-	ast_free(ptr);
-}
-#else
 #define ast_free free
 #define ast_free_ptr ast_free
-#endif
-
-#ifndef __AST_DEBUG_MALLOC
 
 /*
  * This buffer is in static memory. We never intend to read it,