V4L/DVB (11853): minor have assigned value twice

The variable minor have assigned value twice, the first time is in the
initial "video_device" data struct in those drivers, pls see
saa7134-video.c,line 2503.

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Signed-off-by: Figo.zhang <figo.zhang@kolorific.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>