f the DVB math functions to
provide SNR in dB.  The changes are modeled after recent changes made to
the LGDT330x frontends in lgdt330x.c

Signed-off-by: Rusty Scott <rustys@ieee.org>
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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