[media] qt1010: signedness bug in qt1010_init_meas1()

qt1010_init_meas2() returns zero on success and negative error codes on
failure so the return type should be int instead of u8.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>