slqb: use correct name for rcu callback
struct slqb_page defines struct rcu_head rcu_head for rcu, the rcu callback should use it. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Acked-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
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