Make mesh_preq_queue_lock locking consistent with mesh_queue_preq() using
spin_lock_bh().
Signed-off-by: NBaruch Siach <baruch@tkos.co.il>
Signed-off-by: NJavier Cardona <javier@cozybit.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>