FROMGIT: f2fs: drop inode from the donation list when the last file is closed

Let's drop the inode from the donation list when there is no other
open file.

Bug: 434260110
Bug: 435447847
(cherry picked from commit 078cad82
 https: //git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev)
Link: https://lore.kernel.org/linux-f2fs-devel/20250729204719.1253285-1-jaegeuk@kernel.org/


Change-Id: Ic853b8529d4da0020d10b39f08b5d0619b66b870
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(cherry picked from commit 6d950eb4)