smbd: in contend_dirleases() don't bother checking when not enabled

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15984

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Martin Schwenke <martins@samba.org>

Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Mon Jan 26 12:09:13 UTC 2026 on atb-devel-224

Author: slowfranklin

source3/smbd/smb2_oplock.c

@@ -1316,6 +1316,10 @@ void contend_dirleases(struct connection_struct *conn,
 	int ret;
 	bool ok;
 
+	if (!lp_smb3_directory_leases()) {
+		return;
+	}
+
 	if (lease != NULL) {
 		DBG_DEBUG("Parent leasekey %"PRIx64"/%"PRIx64"\n",
 			  lease->parent_lease_key.data[0],