diff -up hdparm-9.60/sysfs.c.bak hdparm-9.60/sysfs.c

--- hdparm-9.60/sysfs.c.bak	2021-04-15 15:48:56.806354847 +0200

+++ hdparm-9.60/sysfs.c	2021-04-16 14:44:42.520395436 +0200

@@ -61,7 +61,8 @@ static int sysfs_write_attr (char *path,

 		if (count < 0)

 			err = errno;

 	}

-	fclose(fp);

+	if (fp)

+		fclose(fp);

 	if (err && verbose) perror(path);

 	*pathtail = '\0';

 	return err;