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Consistently allow reading of messages from a detached shm_mq.

This was intended to work always, but the previous code only allowedit if at least one message was successfully read by the receiverbefore the sender detached the queue.Report by Petr Jelinek. Patch by me.

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src/backend/storage/ipc
- shm_mq.c

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`‎src/backend/storage/ipc/shm_mq.c`

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -406,7 +406,8 @@ shm_mq_receive(shm_mq_handle mqh, Size nbytesp, void **datap, bool nowait)`
`406`	`406`	`if (shm_mq_get_sender(mq)==NULL)`
`407`	`407`	`returnSHM_MQ_WOULD_BLOCK;`
`408`	`408`	`}`
`409`		`-elseif (!shm_mq_wait_internal(mq,&mq->mq_sender,mqh->mqh_handle))`
	`409`	`+elseif (!shm_mq_wait_internal(mq,&mq->mq_sender,mqh->mqh_handle)`
	`410`	`+&&shm_mq_get_sender(mq)==NULL)`
`410`	`411`	`{`
`411`	`412`	`mq->mq_detached= true;`
`412`	`413`	`returnSHM_MQ_DETACHED;`

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Commit5ec45bb

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`‎src/backend/storage/ipc/shm_mq.c`

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