add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/sched/sch_hfsc.c
..
..
@@ -1012,6 +1012,10 @@
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 		if (parent == NULL)
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 			return -ENOENT;
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 	}
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+	if (!(parent->cl_flags & HFSC_FSC) && parent != &q->root) {
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+		NL_SET_ERR_MSG(extack, "Invalid parent - parent class must have FSC");
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+		return -EINVAL;
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+	}
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 	if (classid == 0 || TC_H_MAJ(classid ^ sch->handle) != 0)
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 		return -EINVAL;