Fixed signed/unsigned issues with the property() function of the Adlib driver

svn-id: r45332

3 files changed, 5 insertions, 5 deletions

diff --git a/engines/sci/sfx/sci_midi.h b/engines/sci/sfx/sci_midi.h
index 623dbd9f33..6fbece8dfd 100644
--- a/engines/sci/sfx/sci_midi.h
+++ b/engines/sci/sfx/sci_midi.h
@@ -86,7 +86,7 @@ public:
 	}
 
 	virtual int getVolume() {
-		return _driver ? _driver->property(MIDI_PROP_MASTER_VOLUME, -1) : 0;
+		return _driver ? _driver->property(MIDI_PROP_MASTER_VOLUME, 0xffff) : 0;
  	}
 
 	virtual void playSwitch(bool play) {
diff --git a/engines/sci/sfx/softseq/adlib.cpp b/engines/sci/sfx/softseq/adlib.cpp
index 1623520ea5..e21ddf11f9 100644
--- a/engines/sci/sfx/softseq/adlib.cpp
+++ b/engines/sci/sfx/softseq/adlib.cpp
@@ -629,16 +629,16 @@ bool MidiDriver_Adlib::loadResource(const byte *data, uint size) {
 	return true;
 }
 
-int32 MidiDriver_Adlib::property(int prop, int32 param) {
+uint32 MidiDriver_Adlib::property(int prop, uint32 param) {
 	switch(prop) {
 	case MIDI_PROP_MASTER_VOLUME:
-		if(param != -1)
+		if (param != 0xffff)
 			_masterVolume = param;
 		return _masterVolume;
 	default:
 		break;
 	}
-	return -1;
+	return 0;
 }
 
 
diff --git a/engines/sci/sfx/softseq/adlib.h b/engines/sci/sfx/softseq/adlib.h
index fccf0a2c94..63dd9021a1 100644
--- a/engines/sci/sfx/softseq/adlib.h
+++ b/engines/sci/sfx/softseq/adlib.h
@@ -55,7 +55,7 @@ public:
 	void setVolume(byte volume);
 	void playSwitch(bool play);
 	bool loadResource(const byte *data, uint size);
-	virtual int32 property(int prop, int32 param);
+	uint32 property(int prop, uint32 param);
 
 private:
 	enum ChannelID {