set_mode is called with t->type, which is the tuner type. Instead, use
t->mode which is the actual tuner mode (i.e. radio vs tv).

Cc: stable@kernel.org
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>