kernel/acct.c: use #elif instead of #end and #elif

[ Upstream commit 35189b8ff18ee0c6f7c04f4c674584d1149d5c55 ]

Cleanup: use #elif instead of #end and #elif.

Link: https://lkml.kernel.org/r/20201015150736.GA91603@rlk


Signed-off-by: Hui Su <sh_def@163.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Stable-dep-of: 56d5f3eba3f5 ("acct: perform last write from workqueue")
Signed-off-by: Sasha Levin <sashal@kernel.org>