add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/sound/drivers/mts64.c
..
..
@@ -816,6 +816,9 @@
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 	u8 status, data;
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 	struct snd_rawmidi_substream *substream;
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+	if (!mts)
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+		return;
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+
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 	spin_lock(&mts->lock);
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 	ret = mts64_read(mts->pardev->port);
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 	data = ret & 0x00ff;