src/queue: don't re-wait for CQEs

If ret==to_submit then io_uring_enter did go to waiting path and we
should not repeat it. And that was the intention of a post syscall
data->submit check, but reshuffling spoiled it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/src/queue.c b/src/queue.c
index 4bd4c48..14fee42 100644
--- a/src/queue.c
+++ b/src/queue.c
@@ -125,7 +125,7 @@
 		}
 
 		data->submit -= ret;
-		if (ret == (int)data->submit) {
+		if (!data->submit) {
 			/*
 			 * When SETUP_IOPOLL is set, __sys_io_uring enter()
 			 * must be called to reap new completions but the call