After fixing up a hang on the DViCO FusionHDTV DVB-T Dual Digital 4 (rev
1) recently via http://linuxtv.org/hg/v4l-dvb/rev/1c11cb54f24d everything
appeared to be ok, but I have now noticed certain channels in Australia
are showing corruption which manifest themselves as blockiness and
screeching audio.

I have traced this issue down to
http://linuxtv.org/hg/v4l-dvb/rev/e6a8672631a0 (Fix offset frequencies for
DVB @ 6MHz)

In this change, the offset used by my card has been changed from 2750000
to 2250000.

That is, the old code which works used to do something like
offset = 2750000
if (((priv->cur_fw.type & DTV7) &&
    (priv->cur_fw.scode_table & (ZARLINK456 | DIBCOM52))) ||
    ((priv->cur_fw.type & DTV78) && freq < 470000000))

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