scsi: osd_uld: remove an unneeded NULL check

We don't call the remove() function unless probe() succeeds so "oud"
can't be NULL here.  Plus, if it were NULL, we dereference it on the
next line so it would crash anyway.

[mkp: applied by hand]

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Boaz Harrosh <ooo@electrozaur.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>