ovl: clarify ovl_get_root() semantics

Change the semantics to take a reference on upperdentry instead
of transferrig the reference.

This is needed for upcoming port to new mount api.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
This commit is contained in:
Amir Goldstein 2023-06-17 11:00:24 +03:00
commit 367d002d6c