staging: wilc1000: wilc_msgqueue: release semaphore in error path

It should be called up(&mq->sem) to release semaphore before returning
error codes as -EFAULT when list is empty.

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>