ovl: fix file leak in ovl_real_fdget_meta()

ovl_open_realfile() is wrongly called twice after conversion to
new struct fd.

Fixes: 88a2f646 ("struct fd: representation change")
Reported-by: syzbot+d9efec94dcbfa0de1c07@syzkaller.appspotmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/overlayfs/file.c

@@ -117,7 +117,7 @@ static int ovl_real_fdget_meta(const struct file *file, struct fd *real,
 		struct file *f = ovl_open_realfile(file, &realpath);
 		if (IS_ERR(f))
 			return PTR_ERR(f);
-		real->word = (unsigned long)ovl_open_realfile(file, &realpath) | FDPUT_FPUT;
+		real->word = (unsigned long)f | FDPUT_FPUT;
 		return 0;
 	}