V4L/DVB (7128): tuner: properly handle failed calls to simple_tuner_attach

If simple_tuner_attach fails, set t->type to TUNER_ABSENT,
set t->mode_mask to T_UNINITIALIZED, and exit the set_type function.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>