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[media] videodev: fix a NULL pointer dereference in v4l2_device_relea…
…se() The change in 8280b66 does not cover the case when v4l2_dev is already NULL, fix that. With a Kinect sensor, seen as an USB camera using GSPCA in this context, a NULL pointer dereference BUG can be triggered by just unplugging the device after the camera driver has been loaded. Signed-off-by: Antonio Ospite <email@example.com> Signed-off-by: Mauro Carvalho Chehab <firstname.lastname@example.org>
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