Temporarily revert "Mpeg: Return errors when no audio is available."

This reverts commit c03f6c2.

This caused trouble as seen in #8464, but is probably right - needs other fixes though so
it will have to wait until after 1.2.0.

Core/HLE/sceMpeg.cpp

@@ -1606,18 +1606,12 @@ static int sceMpegGetAtracAu(u32 mpeg, u32 streamId, u32 auAddr, u32 attrAddr)
 	if (ctx->mediaengine->IsVideoEnd()) {
 		INFO_LOG(ME, "video end reach. pts: %i dts: %i", (int)atracAu.pts, (int)ctx->mediaengine->getLastTimeStamp());
 		ringbuffer->packetsAvail = 0;
-		// TODO: Is this correct?
-		if (!ctx->mediaengine->IsNoAudioData()) {
-			WARN_LOG_REPORT(ME, "Video end without audio end, potentially skipping some audio?");
-		}
 		result = ERROR_MPEG_NO_DATA;
 	}
 
 	if (ctx->atracRegistered && ctx->mediaengine->IsNoAudioData() && !ctx->endOfAudioReached) {
 		WARN_LOG(ME, "Audio end reach. pts: %i dts: %i", (int)atracAu.pts, (int)ctx->mediaengine->getLastTimeStamp());
 		ctx->endOfAudioReached = true;
-	}
-	if (ctx->mediaengine->IsNoAudioData()) {
 		result = ERROR_MPEG_NO_DATA;
 	}