Reverting r513. I mistakenly committed my entire tree.

src/handler.c

@@ -89,14 +89,12 @@ void handler_fire_stanza(xmpp_conn_t * const conn,
     while (item) {
 	/* skip newly added handlers */
 	if (!item->enabled) {
-	    prev = item;
 	    item = item->next;
 	    continue;
 	}
 
 	/* don't call user handlers until authentication succeeds */
 	if (item->user_handler && !conn->authenticated) {
-	    prev = item;
 	    item = item->next;
 	    continue;
 	}