Fix counter update bug

Fixes a bug that caused the chain counter to stop advancing when it hit
the first non-empty chain.

communication.c

@@ -308,13 +308,14 @@ void ebt_deliver_counters(struct ebt_u_replace *u_repl)
 	old = u_repl->counters;
 	new = newcounters;
 	while (cc != u_repl->cc) {
-		if (!next || next == entries->entries) {
-			while (chainnr < u_repl->num_chains && (!(entries = u_repl->chains[chainnr]) ||
-			       (next = entries->entries->next) == entries->entries))
-				chainnr++;
-			if (chainnr == u_repl->num_chains)
-				break;
+		while (!next || (next == entries->entries && chainnr < u_repl->num_chains)) {
+			next = NULL;
+			if ((entries = u_repl->chains[chainnr++])) {
+				next = entries->entries->next;
+			}
 		}
+		if (chainnr >= u_repl->num_chains && (!entries || next == entries->entries))
+			break;
 		if (next == NULL)
 			ebt_print_bug("next == NULL");
 		if (cc->type == CNT_NORM) {