V4L/DVB (8682): V4L: fix return value of register video func
If a wrong device type is used with video_register_device_index() it should better return an error number, instead of a constant. Signed-off-by: NHenrik Kretzschmar <henne@nachtwindheim.de> Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>
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