Use delete[] instead of delete for sampleFrame

Fixes warning: 'delete' applied to a pointer-to-array type 'sampleFrame *' (aka 'sample_t (*)[2]') treated as delete[] in mac os build

src/core/RingBuffer.cpp

@@ -75,7 +75,7 @@ void RingBuffer::changeSize( f_cnt_t size )
 	m_buffer = new sampleFrame[ m_size ];
 	memset( m_buffer, 0, m_size * sizeof( sampleFrame ) );
 	m_position = 0;
-	delete tmp;
+	delete[] tmp;
 }