MFV r299233: Apply upstream fix 11edb37a71851b5bcbd4e51ca6ad3dcbf57e9761:

Revert: Don't close stdin...

This have been observed by portupgrade in its interaction with file(1),
as reported as a regression in bin/209211.

PR:		209211
MFC after:	3 days

contrib/file/src/magic.c

@@ -346,7 +346,7 @@ private void
 close_and_restore(const struct magic_set *ms, const char *name, int fd,
     const struct stat *sb)
 {
-	if (name == NULL)
+	if (fd == STDIN_FILENO || name == NULL)
 		return;
 	(void) close(fd);