mm: memcontrol: use __account_obj_stock() in the !locked path

mm: memcontrol: use __account_obj_stock() in the !locked path

Make __account_obj_stock() usable for the case where the local trylock
failed.  Then switch refill_obj_stock() over to it.

This consolidates the mod_objcg_mlstate() call into one place and will
make the next patch easier to follow.

Link: https://lkml.kernel.org/r/20260302195305.620713-5-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Reviewed-by: Hao Li <hao.li@linux.dev>
Cc: Johannes Weiner <jweiner@meta.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>