V4L/DVB (8954): common/tuners: Drop code after return or goto

The break after the return or goto serves no purpose.

Signed-off-by: Julia Lawall <julia@diku.dk>
Reviewed-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>