mptcp: pm: userspace: drop is_userspace in free_local_addr_list

To reduce the path manager's reliance on mptcp_pm_is_userspace()
and mptcp_pm_is_kernel() helpers, this patch drops the check for
mptcp_pm_is_userspace() in mptcp_free_local_addr_list() and
replaces it with a check to see if userspace_pm_local_addr_list
is empty.

Signed-off-by: Geliang Tang <[email protected]>

Author: Geliang Tang

net/mptcp/pm_userspace.c

@@ -18,7 +18,7 @@ void mptcp_free_local_addr_list(struct mptcp_sock *msk)
 	struct sock *sk = (struct sock *)msk;
 	LIST_HEAD(free_list);
 
-	if (!mptcp_pm_is_userspace(msk))
+	if (list_empty(&msk->pm.userspace_pm_local_addr_list))
 		return;
 
 	spin_lock_bh(&msk->pm.lock);