ind_airspeed used uninitialized when _sensorHilEnabled == false

Fixing -Wuninitialized

src/comm/QGCFlightGearLink.cc

@@ -281,12 +281,6 @@ void QGCFlightGearLink::readBytes()
     temperature = values.at(19).toFloat();
     abs_pressure = values.at(20).toFloat()*1e2; //convert to Pa from hPa
 
-    // Send updated state
-    //qDebug()  << "sensorHilEnabled: " << sensorHilEnabled;
-    if (_sensorHilEnabled)
-    {
-        quint16 fields_changed = 0xFFF; //set all 12 used bits
-
     //calculate differential pressure
     const float air_gas_constant = 287.1f; // J/(kg * K)
     const float absolute_null_celsius = -273.15f; // °C
@@ -306,6 +300,12 @@ void QGCFlightGearLink::readBytes()
     
     //qDebug() << "ind_airspeed: " << ind_airspeed << "true_airspeed: " << true_airspeed;
     
+    // Send updated state
+    //qDebug()  << "sensorHilEnabled: " << sensorHilEnabled;
+    if (_sensorHilEnabled)
+    {
+        quint16 fields_changed = 0xFFF; //set all 12 used bits
+
         float pressure_alt = alt;
 
         xmag_ned = cosf(mag_variation);