smbd: pass lease, if any, to notify_fname()

smbd: pass lease, if any, to notify_fname()

notify_fname() for NOTIFY_ACTION_DIRLEASE_BREAK will soon need the lease of the
current open and to implement "MS-FSA 2.1.4.12 Algorithm to Check for an Oplock
Break" with flags=PARENT_OBJECT.

No change in behaviour for now, all callers pass lease=NULL;

Also change path arg to struct smb_filename.

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>