V4L/DVB (5990): cinergyt2_suspend: don't forget to unlock cinergyt2->wq_sem

Restore unlock of cinergyt2->wq_sem, was deleted by accident.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>