sha1_file.c (write_sha1_file): Detect close failure

This is in the same spirit as earlier fix to write_sha1_from_fd().

Signed-off-by: Junio C Hamano <junkio@cox.net>

sha1_file.c

@@ -2020,7 +2020,8 @@ int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned cha
 	if (write_buffer(fd, compressed, size) < 0)
 		die("unable to write sha1 file");
 	fchmod(fd, 0444);
-	close(fd);
+	if (close(fd))
+		die("unable to write sha1 file");
 	free(compressed);
 
 	return move_temp_to_file(tmpfile, filename);