[PATCH] Fix devfs' partition handling

From: Andre Landwehr <andre.landwehr@gmx.net>

with / on an IDE harddisk the disks partitions do not appear in
devfs, only the disc device. This is due to rescan_partitions
being called twice and deleting but not re-creating the entries
during the second call.

hch has acked this.

fs/partitions/check.c

@@ -262,6 +262,7 @@ void delete_partition(struct gendisk *disk, int part)
 	p->nr_sects = 0;
 	p->reads = p->writes = p->read_sectors = p->write_sectors = 0;
 	devfs_unregister(p->de);
+	p->de = NULL;
 	kobject_unregister(&p->kobj);
 }