add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/macintosh/macio-adb.c
..
..
@@ -106,6 +106,10 @@
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 		return -ENXIO;
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 	}
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 	adb = ioremap(r.start, sizeof(struct adb_regs));
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+	if (!adb) {
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+		of_node_put(adbs);
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+		return -ENOMEM;
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+	}
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 	out_8(&adb->ctrl.r, 0);
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 	out_8(&adb->intr.r, 0);