allocate_CoreCoder_TCX_fx(): Missing initialization of hTcxDec->q_synth_history_fx

Bug description

In allocate_CoreCoder_TCX_fx(), the Buffer st->hTcxDec->synth_history_fx is beeing set to 0, however the corresponding Q-value is not reset.

IF( st->hTcxDec == NULL )
{
    IF( ( st->hTcxDec = (TCX_DEC_HANDLE) malloc( sizeof( TCX_DEC_DATA ) ) ) == NULL )
    {
        return ( IVAS_ERROR( IVAS_ERR_FAILED_ALLOC, "Cannot allocate memory for hTcxDec" ) );
    }

    reset_tcx_overl_buf_fx( st->hTcxDec );
    // st->hTcxDec->CngLevelBackgroundTrace_bfi = 0; //initializing to avoid garbage overflow;
    set16_fx( st->hTcxDec->syn_OverlFB, 0, L_FRAME48k / 2 );
    st->hTcxDec->Q_syn_OverlFB = 0;
    move16();
    set16_fx( st->hTcxDec->old_synth, 0, OLD_SYNTH_INTERNAL_DEC );
    st->hTcxDec->q_old_synth = 0;
    move16();
    set16_fx( st->hTcxDec->synth_history_fx, 0, L_PROT48k + L_FRAME48k );
}