f2fs: add missing dput() when printing the donation list

We missed to call dput() on the grabbed dentry.

Fixes: f1a49c1b112b ("f2fs: show the list of donation files")
Reviewed-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/sysfs.c

diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 7992386..6d2a4fb 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -1845,6 +1845,7 @@ static int __maybe_unused donation_list_seq_show(struct seq_file *seq,
 				(loff_t)(fi->donate_end + 1) << (PAGE_SHIFT - 10),
 				(loff_t)inode->i_mapping->nrpages << (PAGE_SHIFT - 10));
 next:
+		dput(dentry);
 		inode_unlock_shared(inode);
 		iput(inode);
 	}