[media] v4l: Fix use-after-free case in v4l2_device_release
Drivers that have no v4l2_device release callback might free the v4l2_device instance in the video_device release callback. Make sure we don't access the v4l2_device instance after it gets freed. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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