Merged revisions 176948 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

........
  r176948 | dbailey | 2009-02-18 10:09:12 -0600 (Wed, 18 Feb 2009) | 2 lines
  
  Need to take into account the \0 terminator of the old string to determine the amount available.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.0@177004 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/utils.c

@@ -1493,7 +1493,7 @@ void __ast_string_field_ptr_build_va(struct ast_string_field_mgr *mgr,
 	*/
 	if ((*ptr)[0] != '0') {
 		target = (char *) *ptr;
-		available = strlen(target);
+		available = strlen(target) + 1;
 	} else {
 		target = (*pool_head)->base + mgr->used;
 		available = space;