Remove dialog properly at unload of module (rizzo)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@47307 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -13554,13 +13554,7 @@ int unload_module()
 		while (p) {
 			pl = p;
 			p = p->next;
-			/* Free associated memory */
-			ast_mutex_destroy(&pl->lock);
-			if (pl->chanvars) {
-				ast_variables_destroy(pl->chanvars);
-				pl->chanvars = NULL;
-			}
-			free(pl);
+			__sip_destroy(p, 1);
 		}
 		iflist = NULL;
 		ast_mutex_unlock(&iflock);