Return sense if dm_split_args is called with a NULL input parameter.
Signed-off-by: NDavid Teigland <teigland@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>