media: ir_toy: assignment to be16 should be of correct type

commit f0c15b36 ("media: ir_toy: prevent device from hanging during
transmit") removed a cpu_to_be16() cast, which causes a sparse warning.

Fixes: f0c15b36 ("media: ir_toy: prevent device from hanging during transmit")
Reported-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>