mdcheck: don't git error if not /dev/md?* devices exist.

If there are no such devices, the 'for' will set '$dev' to
'/dev/md?*', which should be ignored.

Signed-off-by: NeilBrown <neilb@suse.de>
Rebuildmap: strip local host name from device name.

When /run/mdadm/map is being rebuilt, e.g. by "mdadm -Ir",
if the device doesn't exist in /dev, we have to choose
a name.
Currently we don't strip the hostname which is wrong if
it is the local host.

Reported-by: Stephen Kent <smkent@smkent.net>
Signed-off-by: NeilBrown <neilb@suse.de>
super1: remove some debugging printfs in update_super1

These should never have been there.

Signed-off-by: NeilBrown <neilb@suse.de>