add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/testing/selftests/proc/proc-self-wchan.c
..
..
@@ -27,7 +27,7 @@
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 	fd = open("/proc/self/wchan", O_RDONLY);
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 	if (fd == -1) {
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 		if (errno == ENOENT)
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-			return 2;
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+			return 4;
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 		return 1;
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 	}
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