f2fs: should put a page when checking the summary info

The commit introduces another bug.

Cc: stable@vger.kernel.org
Fixes: c6ad7fd1 ("f2fs: fix to do sanity check on summary info")
Signed-off-by: Pavel Machek <pavel@denx.de>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>