replicator: fixed infinity loop on sync replication
https://github.com/dovecot/core/pull/223

Index: src/replication/replicator/replicator-queue.c
--- src/replication/replicator/replicator-queue.c.orig
+++ src/replication/replicator/replicator-queue.c
@@ -333,6 +333,7 @@ replicator_queue_handle_sync_lookups(struct replicator
 		} else {
 			array_push_back(&callbacks, &lookups[i]);
 			array_delete(&queue->sync_lookups, i, 1);
+			count--;
 		}
 	}
 
