shm_mq: Repair breakage from previous commit.

If the counterparty writes some data into the queue and then detaches,
it's wrong to return SHM_MQ_DETACHED right away.  If we do that, we
fail to read whatever was written.

src/backend/storage/ipc/shm_mq.c

@@ -500,12 +500,14 @@ shm_mq_receive(shm_mq_handle *mqh, Size *nbytesp, void **datap, bool nowait)
 	if (!mqh->mqh_counterparty_attached)
 	{
 		if (nowait)
+		{
+			if (shm_mq_get_sender(mq) == NULL)
 			{
 				if (shm_mq_counterparty_gone(mq, mqh->mqh_handle))
 					return SHM_MQ_DETACHED;
-			if (shm_mq_get_sender(mq) == NULL)
 				return SHM_MQ_WOULD_BLOCK;
 			}
+		}
 		else if (!shm_mq_wait_internal(mq, &mq->mq_sender, mqh->mqh_handle)
 				 && shm_mq_get_sender(mq) == NULL)
 		{