Remove unnecessary cast.

README.md

@@ -73,7 +73,7 @@ void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uin
         return;
     }
 
-    ma_decoder_read_pcm_frames(pDecoder, pOutput, (ma_uint64)frameCount, NULL);
+    ma_decoder_read_pcm_frames(pDecoder, pOutput, frameCount, NULL);
 
     (void)pInput;
 }