add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/s390/kernel/sysinfo.c
..
..
@@ -545,8 +545,6 @@
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 	int lvl, i;
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 	stsi_root = debugfs_create_dir("stsi", arch_debugfs_dir);
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-	if (IS_ERR_OR_NULL(stsi_root))
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-		return 0;
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 	lvl = stsi(NULL, 0, 0, 0);
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 	if (lvl > 0)
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 		stsi_0_0_0 = lvl;