set pointers to NULL after freeing memory to avoid multiple free()

probably 1.4/1.2 issue as well if someone can look into that.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@48001 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel.c

@@ -1027,6 +1027,7 @@ static void free_cid(struct ast_callerid *cid)
 		free(cid->cid_ani);
 	if (cid->cid_rdnis)
 		free(cid->cid_rdnis);
+	cid->cid_dnid = cid->cid_num = cid->cid_name = cid->cid_ani = cid->cid_rdnis = NULL;
 }
 
 /*! \brief Free a channel structure */