add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/md/persistent-data/dm-btree-spine.c
..
..
@@ -132,15 +132,13 @@
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 	s->nodes[1] = NULL;
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 }
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-int exit_ro_spine(struct ro_spine *s)
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+void exit_ro_spine(struct ro_spine *s)
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 {
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-	int r = 0, i;
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+	int i;
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 	for (i = 0; i < s->count; i++) {
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 		unlock_block(s->info, s->nodes[i]);
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 	}
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-
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-	return r;
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 }
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 int ro_step(struct ro_spine *s, dm_block_t new_child)