add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/md/persistent-data/dm-btree.c
..
..
@@ -368,7 +368,8 @@
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 	} while (!(flags & LEAF_NODE));
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 	*result_key = le64_to_cpu(ro_node(s)->keys[i]);
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-	memcpy(v, value_ptr(ro_node(s), i), value_size);
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+	if (v)
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+		memcpy(v, value_ptr(ro_node(s), i), value_size);
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 	return 0;
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 }