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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, wefail to read whatever was written.

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src/backend/storage/ipc
- shm_mq.c

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`‎src/backend/storage/ipc/shm_mq.c`

Lines changed: 4 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -501,10 +501,12 @@ shm_mq_receive(shm_mq_handle mqh, Size nbytesp, void **datap, bool nowait)`
`501`	`501`	`{`
`502`	`502`	`if (nowait)`
`503`	`503`	`{`
`504`		`-if (shm_mq_counterparty_gone(mq,mqh->mqh_handle))`
`505`		`-returnSHM_MQ_DETACHED;`
`506`	`504`	`if (shm_mq_get_sender(mq)==NULL)`
	`505`	`+{`
	`506`	`+if (shm_mq_counterparty_gone(mq,mqh->mqh_handle))`
	`507`	`+returnSHM_MQ_DETACHED;`
`507`	`508`	`returnSHM_MQ_WOULD_BLOCK;`
	`509`	`+}`
`508`	`510`	`}`
`509`	`511`	`elseif (!shm_mq_wait_internal(mq,&mq->mq_sender,mqh->mqh_handle)`
`510`	`512`	`&&shm_mq_get_sender(mq)==NULL)`

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Commita1480ec

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`‎src/backend/storage/ipc/shm_mq.c`

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