f2fs: Fix __write_node_folio() conversion

This conversion moved the folio_unlock() to inside __write_node_folio(),
but missed one caller so we had a double-unlock on this path.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Chao Yu <chao@kernel.org>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Reported-by: syzbot+c0dc46208750f063d0e0@syzkaller.appspotmail.com
Fixes: 80f31d2 (f2fs: return bool from __write_node_folio)
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Author: Matthew Wilcox (Oracle)

fs/f2fs/node.c

@@ -2078,7 +2078,6 @@ int f2fs_sync_node_pages(struct f2fs_sb_info *sbi,
 
 			if (!__write_node_folio(folio, false, &submitted,
 					wbc, do_balance, io_type, NULL)) {
-				folio_unlock(folio);
 				folio_batch_release(&fbatch);
 				ret = -EIO;
 				goto out;