Fix a bug in ma_audio_buffer_ref_read_pcm_frames().

The bug here is the pFramesOut pointer was not getting offset correctly
when looping.

Public issue https://github.com/mackron/miniaudio/issues/442

miniaudio.h

@@ -55308,7 +55308,7 @@ MA_API ma_uint64 ma_audio_buffer_ref_read_pcm_frames(ma_audio_buffer_ref* pAudio
         }
 
         if (pFramesOut != NULL) {
-            ma_copy_pcm_frames(pFramesOut, ma_offset_ptr(pAudioBufferRef->pData, pAudioBufferRef->cursor * ma_get_bytes_per_frame(pAudioBufferRef->format, pAudioBufferRef->channels)), framesToRead, pAudioBufferRef->format, pAudioBufferRef->channels);
+            ma_copy_pcm_frames(ma_offset_ptr(pFramesOut, totalFramesRead * ma_get_bytes_per_frame(pAudioBufferRef->format, pAudioBufferRef->channels)), ma_offset_ptr(pAudioBufferRef->pData, pAudioBufferRef->cursor * ma_get_bytes_per_frame(pAudioBufferRef->format, pAudioBufferRef->channels)), framesToRead, pAudioBufferRef->format, pAudioBufferRef->channels);
         }
 
         totalFramesRead += framesToRead;