Fix possible ununitialized but used variables

src/comm/MAVLinkSimulationLink.cc

@@ -677,6 +677,9 @@ void MAVLinkSimulationLink::writeBytes(const char* data, qint64 size)
     int streampointer = 0;
     uint8_t buffer[MAVLINK_MAX_PACKET_LEN];
     int bufferlength = 0;
+    
+    // Initialize drop count to 0 so it isn't referenced uninitialized when returned at the bottom of this function
+    comm.packet_rx_drop_count = 0;
 
     // Output all bytes as hex digits
     for (int i=0; i<size; i++)

src/ui/configuration/FlightModeConfig.cc

@@ -222,7 +222,7 @@ void FlightModeConfig::remoteControlChannelRawChanged(int chan, float val)
     if (chan == _modeSwitchRCChannel)
     {
         qDebug() << chan << val;
-        size_t highlightIndex;
+        size_t highlightIndex = _cModes; // initialize to unreachable index
         
         for (size_t i=0; i<_cModes; i++) {
             if (val < _rgModePWMBoundary[i]) {