Commit2209c0f

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Preserve errno across free().

Dept. of second thoughts: free() isn't guaranteed not to change errno.Make sure we report the right error if getcwd() fails.

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Original file line number	Diff line number	Diff line change
`@@ -608,7 +608,10 @@ make_absolute_path(const char *path)`
`608`	`608`	`}`
`609`	`609`	`else`
`610`	`610`	`{`
	`611`	`+intsave_errno=errno;`
	`612`	`+`
`611`	`613`	`free(buf);`
	`614`	`+errno=save_errno;`
`612`	`615`	`#ifndefFRONTEND`
`613`	`616`	`elog(ERROR,"could not get current working directory: %m");`
`614`	`617`	`#else`

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