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Correct off-by-one when reading from pipe

In pg_basebackup.c:reached_end_position(), we're reading from aninternal pipe with our own background process but we're possiblyreading more bytes than will actually fit into our buffer due toan off-by-one error. As we're reading from an internal pipethere's no real risk here, but it's good form to not depend onsuch convenient arrangements.Bug spotted by the Coverity scanner.Back-patch to 9.2 where this showed up.

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src/bin/pg_basebackup
- pg_basebackup.c

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`‎src/bin/pg_basebackup/pg_basebackup.c‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -166,7 +166,7 @@ reached_end_position(XLogRecPtr segendpos, uint32 timeline,`
`166`	`166`	`charxlogend[64];`
`167`	`167`
`168`	`168`	`MemSet(xlogend,0,sizeof(xlogend));`
`169`		`-r=read(bgpipe[0],xlogend,sizeof(xlogend));`
	`169`	`+r=read(bgpipe[0],xlogend,sizeof(xlogend)-1);`
`170`	`170`	`if (r<0)`
`171`	`171`	`{`
`172`	`172`	`fprintf(stderr,_("%s: could not read from ready pipe: %s\n"),`

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Commita3957ac

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`‎src/bin/pg_basebackup/pg_basebackup.c‎`

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