Mpeg: Return errors when no audio is available.

Before, we were only returning an error once, in an effort to log only
once.  This meant sometimes games would not realize they needed to add
packets.

Core/HLE/sceMpeg.cpp

@@ -1602,12 +1602,18 @@ 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;
 	}