V4L/DVB (11956): dsbr100: no need to pass curfreq value to dsbr100_setfreq()

Small cleanup of dsbr100_setfreq(). No need to pass radio->curfreq value
to this function.

Signed-off-by: Alexey Klimov <klimov.linux@gmail.com>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>