xfrm: delete offloaded policy

The policy memory was released but not HW driver data. Add
call to xfrm_dev_policy_delete(), so drivers will have a chance
to release their resources.

Fixes: 919e43fa ("xfrm: add an interface to offload policy")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/xfrm/xfrm_user.c

@@ -2345,6 +2345,7 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
 					    NETLINK_CB(skb).portid);
 		}
 	} else {
+		xfrm_dev_policy_delete(xp);
 		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
 
 		if (err != 0)