Commit3fdc1d2

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C comment: mention why no setting lasterrno in dir_existsfile()

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Original file line number	Diff line number	Diff line change
`@@ -594,6 +594,11 @@ dir_existsfile(WalWriteMethod wwmethod, const char pathname)`
`594`	`594`
`595`	`595`	`fd=open(tmppath,O_RDONLY \|PG_BINARY,0);`
`596`	`596`	`if (fd<0)`
	`597`	`+`
	`598`	`+/*`
	`599`	`+ * Skip setting dir_data->lasterrno here because we are only checking`
	`600`	`+ * for existence.`
	`601`	`+ */`
`597`	`602`	`return false;`
`598`	`603`	`close(fd);`
`599`	`604`	`return true;`

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