mm/memcontrol.c: fix a -Wunused-function warning

mem_cgroup_id_get() was introduced in commit 73f576c ("mm:memcontrol:
fix cgroup creation failure after many small jobs").

Later, it no longer has any user since the commits,

1f47b61 ("mm: memcontrol: fix swap counter leak on swapout from offline cgroup")
58fa2a5 ("mm: memcontrol: add sanity checks for memcg->id.ref on get/put")

so safe to remove it.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Qian Cai <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Vladimir Davydov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: Qian Cai

mm/memcontrol.c

@@ -4930,11 +4930,6 @@ static void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n)
 	}
 }
 
-static inline void mem_cgroup_id_get(struct mem_cgroup *memcg)
-{
-	mem_cgroup_id_get_many(memcg, 1);
-}
-
 static inline void mem_cgroup_id_put(struct mem_cgroup *memcg)
 {
 	mem_cgroup_id_put_many(memcg, 1);