[media] r820t: better report signal strength
If signal is zero, shows it as a zero, not as 0xff. Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com> Tested-by: NAntti Palosaari <crope@iki.fi>
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If signal is zero, shows it as a zero, not as 0xff. Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com> Tested-by: NAntti Palosaari <crope@iki.fi>