The m_parms.tot_errs array is not initialized prior to its first use
in the RDSDemod::biphase function. ASAN does not pick up on this
directly, but instead reports it as follows (note that ASAN fills
memory with 0xBE and -1094795586 is 0xBEBEBEBE):
./plugins/channelrx/demodbfm/rdsdemod.cpp:159:95: runtime error: signed
integer overflow: -1094795586 + -1094795586 cannot be represented in type
'int'
The m_parms.subcarr_bb array does not appear to be read prior to
initialization, but we initialize it to zero anyway for the sake
of good hygiene.
