[PATCH] md: Clear clevel whenever level is set.

The 'level' of an md array can be set as either a number of a string.  When
one is set, the other must be marked 'undefined'.  This wasn't being done
in one place: where new arrays are created.

Result: if md1 is a raid1, it is stopped and a raid5 is created there, it
might still appear to be a raid1.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/md/md.c

@@ -3395,6 +3395,7 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
 	mddev->ctime         = get_seconds();
 
 	mddev->level         = info->level;
+	mddev->clevel[0]     = 0;
 	mddev->size          = info->size;
 	mddev->raid_disks    = info->raid_disks;
 	/* don't set md_minor, it is determined by which /dev/md* was