[PATCH] pktcdvd: Correctly set rq->cmd_len in pkt_generic_packet()

It looks like the code in pkt_generic_packet() worked by luck in the past, but
after commit 186d330e leaving rq->cmd_len
uninitialized doesn't work any more.

Signed-off-by: Peter Osterlund <petero2@telia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>