[PATCH] ide-disk.c: fix for IDE CF card ejection with devfs

From: Pavel Roskin <proski@gnu.org>

If I eject IDE CompactFlash card, I get a stack dump from
devfs_remove() because ide/host2/bus0/target0/lun0 doesn't exist.

After del_gendisk() is called from idedisk_cleanup() drive->devfs_name refers
to a non-existent directory and should be erased, so that ide_unregister()
doesn't try to remove that directory again.

drivers/ide/ide-disk.c

@@ -1695,6 +1695,7 @@ static int idedisk_cleanup (ide_drive_t *drive)
 	if (ide_unregister_subdriver(drive))
 		return 1;
 	del_gendisk(g);
+	drive->devfs_name[0] = '\0';
 	g->fops = ide_fops;
 	return 0;
 }