media: uvcvideo: Remove redundant NULL assignment

commit 04d3398f upstream.

ctrl->handle will only be different than NULL for controls that have
mappings. This is because that assignment is only done inside
uvc_ctrl_set() for mapped controls.

Cc: stable@vger.kernel.org
Fixes: e5225c82 ("media: uvcvideo: Send a control event when a Control Change interrupt arrives")
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20241203-uvc-fix-async-v6-2-26c867231118@chromium.org


Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>