V4L/DVB: cx25821: fix coding style issues in cx25821-medusa-video.c

Fixes up warnings and errors found by the checkpatch.pl tool on
cx25821-medusa-video.c
Signed-off-by: NOlimpiu Pascariu <olimpiu.pascariu@gmail.com>
Acked-by: NDan Carpenter <error27@gmail.com>
Cc: Palash Bandyopadhyay <palash.bandyopadhyay@conexant.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>