memcg: free spare array to avoid memory leak
When the last event is unregistered, there is no need to keep the spare array anymore. So free it to avoid memory leak. Signed-off-by: NSha Zhengju <handai.szj@taobao.com> Acked-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: NKirill A. Shutemov <kirill@shutemov.name> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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