Fix warnings about shortening 64 bits to 32 bits.

stepmania/src/arch/Sound/RageSoundDriver.h

@@ -150,7 +150,7 @@ private:
 		float *m_BufferNext; // beginning of the unread data
 		int m_FramesInBuffer; // total number of frames at m_BufferNext
 		int64_t m_iPosition; // stream frame of m_BufferNext
-		sound_block() { m_FramesInBuffer = m_iPosition = 0; m_BufferNext = m_Buffer; }
+		sound_block() { m_FramesInBuffer = 0; m_iPosition = 0; m_BufferNext = m_Buffer; }
 	};
 
 	struct Sound

stepmania/src/arch/Sound/RageSoundDriver_AU.cpp

@@ -326,7 +326,7 @@ float RageSoundDriver_AU::GetPlayLatency() const
 		bufferSize += frames;
 	} while( false );
 	
-	return bufferSize / sampleRate;
+	return float( bufferSize / sampleRate );
 }