V4L/DVB: em28xx: fix a compilation warning
drivers/media/video/em28xx/em28xx-video.c: In function ‘vidioc_s_register’:
drivers/media/video/em28xx/em28xx-video.c:1617: warning: unused variable ‘rc’
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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