rs41: battery voltage, one byte enough for Volt*10

demod/mod/rs41mod.c

@@ -369,14 +369,14 @@ static int get_BattVolts(gpx_t *gpx, int ofs) {
     int i;
     unsigned byte;
     ui8_t batt_bytes[2];
-    float batt_volts;
+    ui16_t batt_volts; // signed voltage?
 
     for (i = 0; i < 2; i++) {
         byte = gpx->frame[pos_BattVolts+ofs + i];
         batt_bytes[i] = byte;
     }
-
-    batt_volts = (float)(batt_bytes[0] + (batt_bytes[1] << 8));
+                                // 2 bytes? V > 25.5 ?
+    batt_volts = batt_bytes[0]; // + (batt_bytes[1] << 8);
     gpx->batt = batt_volts/10.0;
 
     return 0;