RCG: correct dac duotone amplitude

DAC duotone is a straight copy of the ADC duotone signal into a DAC channel. This code takes into account the different bit resolution of the various parts so that DAC duotone amplitude is the same for the various combinations of ADC and DAC.

src/fe/map.c

@@ -105,6 +105,11 @@ mapPciModules( CDS_HARDWARE* pCds )
     dacdev = NULL;
     status = 0;
 
+    // initialize dac duotone multipliers/divisors in case
+    // we don't have one or the other of DAC or ADC cards
+    pCds->adcDuoToneDivisor[ 0 ] = 1;
+    pCds->dacDuoToneMultiplier[ 0 ] = 1;
+
    modCount = map_cards_2_slots ( &cdsPciModules ) ;
 
     // Map and Initialize ADC and DAC modules