fixed pointer additions leading to horrible noises under certain circumstances

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1850 0778d3d1-df1d-0410-868b-ea421aaaa00d

src/core/audio/audio_alsa.cpp

@@ -268,7 +268,7 @@ void audioALSA::run( void )
 							m_convertEndian );
 			}
 			int min_len = qMin( len, outbuf_size - outbuf_pos );
-			memcpy( ptr, outbuf + outbuf_pos,
+			memcpy( ptr, (int_sample_t *) outbuf + outbuf_pos,
 					min_len * sizeof( int_sample_t ) );
 			ptr += min_len;
 			len -= min_len;