mptcp_pm_has_subflow_saddr
remove_subflow = mptcp_pm_has_subflow_saddr(msk, addr);
if (mptcp_pm_has_subflow_saddr(msk, &entry->addr))
else if (!mptcp_pm_has_subflow_saddr(msk, &entry->addr))
bool mptcp_pm_has_subflow_saddr(const struct mptcp_sock *msk,