In case of failure the return value was always 0. Return proper
error code (ENODEV) instead.
Signed-off-by: NLuis Alves <ljalvs@gmail.com>
Signed-off-by: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>