[media] usbvision fix overflow of interfaces array
This fixes the crash reported in: http://seclists.org/bugtraq/2015/Oct/35 The interface number needs a sanity check. Signed-off-by: NOliver Neukum <oneukum@suse.com> Cc: Vladis Dronov <vdronov@redhat.com> Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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