V4L/DVB (10848): zoran: Change first argument to zoran_v4l2_buffer_status

It was a struct file *, but all that function wants is the struct zoran_fh
from the file's private data.  Since every caller already has this, just
pass the zoran_fh instead.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>