Exit stv090x_algo() if the tuner did not lock. This might happen due to
missing signal or invalid/incomplete tuning parameters.
Signed-off-by: NOliver Endriss <o.endriss@gmx.de>
Signed-off-by: NManu Abraham <abraham.manu@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>