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Free PQresult on error in pg_receivexlog.

The leak is fairly small and rare, but a leak nevertheless.Per Coverity report. Backpatch to 9.2, where pg_receivexlog was added.pg_basebackup shares the code, but it always exits on error, so there isno real leak.

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src/bin/pg_basebackup
- receivelog.c

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`‎src/bin/pg_basebackup/receivelog.c`

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Original file line number	Diff line number	Diff line change
`@@ -912,6 +912,7 @@ HandleCopyStream(PGconn *conn, XLogRecPtr startpos, uint32 timeline,`
`912`	`912`	`if (!close_walfile(basedir,partial_suffix))`
`913`	`913`	`{`
`914`	`914`	`/* Error message written in close_walfile() */`
	`915`	`+PQclear(res);`
`915`	`916`	`gotoerror;`
`916`	`917`	`}`
`917`	`918`	`if (PQresultStatus(res)==PGRES_COPY_IN)`
`@@ -921,6 +922,7 @@ HandleCopyStream(PGconn *conn, XLogRecPtr startpos, uint32 timeline,`
`921`	`922`	`fprintf(stderr,`
`922`	`923`	`_("%s: could not send copy-end packet: %s"),`
`923`	`924`	`progname,PQerrorMessage(conn));`
	`925`	`+PQclear(res);`
`924`	`926`	`gotoerror;`
`925`	`927`	`}`
`926`	`928`	`res=PQgetResult(conn);`

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Commit0ad7830

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`‎src/bin/pg_basebackup/receivelog.c`

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