mptcp: move the declarations of ssk and subflow

Move the declarations of ssk and subflow in MP_FAIL and MP_PRIO to the
beginning of the function mptcp_write_options().
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/mptcp/options.c

@@ -1264,10 +1264,10 @@ static u16 mptcp_make_csum(const struct mptcp_ext *mpext)
 void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
 			 struct mptcp_out_options *opts)
 {
-	if (unlikely(OPTION_MPTCP_FAIL & opts->suboptions)) {
 	const struct sock *ssk = (const struct sock *)tp;
 	struct mptcp_subflow_context *subflow;
 
+	if (unlikely(OPTION_MPTCP_FAIL & opts->suboptions)) {
 		subflow = mptcp_subflow_ctx(ssk);
 		subflow->send_mp_fail = 0;
 
@@ -1489,9 +1489,6 @@ void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
 	}
 
 	if (OPTION_MPTCP_PRIO & opts->suboptions) {
-		const struct sock *ssk = (const struct sock *)tp;
-		struct mptcp_subflow_context *subflow;
-
 		subflow = mptcp_subflow_ctx(ssk);
 		subflow->send_mp_prio = 0;