Merged revisions 212498 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

........
  r212498 | jpeeler | 2009-08-17 11:34:56 -0500 (Mon, 17 Aug 2009) | 12 lines
  
  Fix segfault when reloading chan_misdn.
  
  If more ports were specified than configured in misdn.conf a reload would crash
  asterisk. The problem was the unconfigured port was using data from the
  previously configured port. When the data for an unconfigured port was freed a
  crash would result from the double free.
  
  (closes issue #12113)
  Reported by: agupta
  Patches:
        bug12113.patch uploaded by jpeeler (license 325)
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@212506 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/misdn_config.c

@@ -1035,6 +1035,11 @@ static void _build_port_config (struct ast_variable *v, char *cat)
 	}
 
 	for (i = 0; i < (max_ports + 1); ++i) {
+		if (i > 0 && cfg_for_ports[0]) {
+			/* default category, will populate the port_cfg with additional port
+			categories in subsequent calls to this function */
+			memset(cfg_tmp, 0, sizeof(cfg_tmp));
+		}
 		if (cfg_for_ports[i]) {
 			memcpy(port_cfg[i], cfg_tmp, sizeof(cfg_tmp));
 		}