fix: Fix more sign / implicit type conversion warnings

Author: Francois Best

src/MIDI.cpp

@@ -95,7 +95,7 @@ unsigned decodeSysEx(const byte* inSysEx, byte* outData, unsigned inLength)
         else
         {
             const byte body = inSysEx[i];
-            const byte msb  = ((msbStorage >> byteIndex--) & 1) << 7;
+            const byte msb  = byte(((msbStorage >> byteIndex--) & 1) << 7);
             outData[count++] = msb | body;
         }
     }

src/MIDI.hpp

@@ -292,7 +292,7 @@ template<class SerialPort, class Settings>
 void MidiInterface<SerialPort, Settings>::sendPitchBend(int inPitchValue,
                                                         Channel inChannel)
 {
-    const unsigned bend = inPitchValue - MIDI_PITCHBEND_MIN;
+    const unsigned bend = unsigned(inPitchValue - int(MIDI_PITCHBEND_MIN));
     send(PitchBend, (bend & 0x7f), (bend >> 7) & 0x7f, inChannel);
 }