[PATCH -next] mm/hugetlb_cgroup: fix a -Wunused-but-set-variable

[Qian Cai <cai@lca.pw>]

The commit c32300516047 ("hugetlb_cgroup: add interface for
charge/uncharge hugetlb reservations") forgot to remove an unused
variable,

mm/hugetlb_cgroup.c: In function 'hugetlb_cgroup_migrate':
mm/hugetlb_cgroup.c:777:25: warning: variable 'h_cg' set but not used
[-Wunused-but-set-variable]
  struct hugetlb_cgroup *h_cg;
                         ^~~~

Signed-off-by: Qian Cai <cai@lca.pw>
---
 mm/hugetlb_cgroup.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index ad777fecad28..8a86a2b62bef 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -774,7 +774,6 @@ void __init hugetlb_cgroup_file_init(void)
  */
 void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
 {
-	struct hugetlb_cgroup *h_cg;
 	struct hugetlb_cgroup *h_cg_rsvd;
 	struct hstate *h = page_hstate(oldhpage);
 
@@ -783,7 +782,6 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
 
 	VM_BUG_ON_PAGE(!PageHuge(oldhpage), oldhpage);
 	spin_lock(&hugetlb_lock);
-	h_cg = hugetlb_cgroup_from_page(oldhpage);
 	h_cg_rsvd = hugetlb_cgroup_from_page_rsvd(oldhpage);
 	set_hugetlb_cgroup(oldhpage, NULL);
 
-- 
1.8.3.1