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gspca_sn9c20x: Fix NULL pointer dereference
Don't call v4l2_ctrl_g_ctrl on ctrls which the model cam in question does not have. Reported-by: NFrank Schäfer <fschaefer.oss@googlemail.com> Signed-off-by: NHans de Goede <hdegoede@redhat.com> [ Taken directly, since Mauro is on vacation ] Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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