Fix unused parameter warning on non-macOS platforms

app/streaming/video/ffmpeg.cpp

@@ -990,6 +990,8 @@ void FFmpegVideoDecoder::logVideoStats(VIDEO_STATS& stats, const char* title)
 
 IFFmpegRenderer* FFmpegVideoDecoder::createHwAccelRenderer(const AVCodecHWConfig* hwDecodeCfg, PDECODER_PARAMETERS params, int pass)
 {
+    Q_UNUSED(params);
+
     if (!(hwDecodeCfg->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX)) {
         return nullptr;
     }