fd7daa727126 breaks buildkernel when KERN_TLS is not defined

Commit fd7daa727126 to /usr/src/sys/netinet/tcp_usrreq.c breaks buildkernel
when KERN_TLS is not defined.

This patch fixes it for me:

--- tcp_usrreq.c.orig	2022-02-09 10:25:46.851034000 +0000
+++ tcp_usrreq.c	2022-02-09 10:30:27.541058000 +0000
@@ -2119,12 +2119,12 @@
 int
 tcp_default_ctloutput(struct inpcb *inp, struct sockopt *sopt)
 {
-	struct socket *so = inp->inp_socket;
 	struct tcpcb *tp = intotcpcb(inp);
 	int	error, opt, optval;
 	u_int	ui;
 	struct	tcp_info ti;
 #ifdef KERN_TLS
+	struct socket *so = inp->inp_socket;
 	struct tls_enable tls;
 #endif
 	char	*pbuf, buf[TCP_LOG_ID_LEN];
@@ -2136,7 +2136,9 @@
 	INP_WLOCK_ASSERT(inp);
 	KASSERT((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) == 0,
 	    ("inp_flags == %x", inp->inp_flags));
+#ifdef KERN_TLS
 	KASSERT(so != NULL, ("inp_socket == NULL"));
+#endif
 
 	switch (sopt->sopt_level) {
 #ifdef INET6

-- 
Gary Jennejohn