V4L/DVB: zoran: match parameter signedness of g_input_status

The second parameter of g_input_status operation in <media/v4l2-subdev.h>
is unsigned so also call it with unsigned paramter.

This will remove the following sparse warning (see "make C=1"):
 * incorrect type in argument 2 (different signedness)
       expected unsigned int [usertype] *status
       got int *<noident>

Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>