This was spotted by coverity (cid #793).  All callers dereference dev
before calling this functions, and we dereference it earlier in the
function, when initializing lp.

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>