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Fix unsafe usage of strerror(errno) within ereport().

This is the converse of the unsafe-usage-of-%m problem: the reasonereport/elog provide that format code is mainly to dodge the hazardof errno getting changed before control reaches functions within thearguments of the macro. I only found one instance of this hazard,but it's been there since 9.4 :-(.

1 parenta13b47a commit81256cdCopy full SHA for 81256cd

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src/backend/libpq
- auth.c

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`‎src/backend/libpq/auth.c`

Lines changed: 3 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -2041,10 +2041,12 @@ auth_peer(hbaPort *port)`
`2041`	`2041`	`pw=getpwuid(uid);`
`2042`	`2042`	`if (!pw)`
`2043`	`2043`	`{`
	`2044`	`+intsave_errno=errno;`
	`2045`	`+`
`2044`	`2046`	`ereport(LOG,`
`2045`	`2047`	`(errmsg("could not look up local user ID %ld: %s",`
`2046`	`2048`	`(long)uid,`
`2047`		`-errno ?strerror(errno) :_("user does not exist"))));`
	`2049`	`+save_errno ?strerror(save_errno) :_("user does not exist"))));`
`2048`	`2050`	`returnSTATUS_ERROR;`
`2049`	`2051`	`}`
`2050`	`2052`

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Commit81256cd

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`‎src/backend/libpq/auth.c`

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