ovl: pass realinode to ovl_encode_real_fh() instead of realdentry

[ Upstream commit 07aeefae ]

We want to be able to encode an fid from an inode with no alias.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Link: https://lore.kernel.org/r/20250105162404.357058-2-amir73il@gmail.com


Signed-off-by: Christian Brauner <brauner@kernel.org>
Stable-dep-of: c45beebf ("ovl: support encoding fid from inode with no alias")
Signed-off-by: Sasha Levin <sashal@kernel.org>