This fixes the following panic.
[145091] --- trap 0xc, rip = 0xffffffff80c00411, rsp = 0xfffffe0025192840, rbp = 0xfffffe0025192860 ---
[145091] vmem_xfree() at vmem_xfree+0xd1/frame 0xfffffe0025192860
[145091] tls_uninit_toep() at tls_uninit_toep+0x78/frame 0xfffffe0025192880
[145091] free_toepcb() at free_toepcb+0x32/frame 0xfffffe00251928a0
[145091] t4_connect() at t4_connect+0x3be/frame 0xfffffe0025192950
[145091] tcp_offload_connect() at tcp_offload_connect+0xa4/frame 0xfffffe0025192990
[145091] tcp_usr_connect() at tcp_usr_connect+0xec/frame 0xfffffe00251929f0
[145091] soconnect() at soconnect+0xae/frame 0xfffffe0025192a30
[145091] kern_connectat() at kern_connectat+0xe2/frame 0xfffffe0025192a90
[145091] sys_connect() at sys_connect+0x75/frame 0xfffffe0025192ad0
[145091] amd64_syscall() at amd64_syscall+0x137/frame 0xfffffe0025192bf0
[145091] fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0025192bf0
[145091] --- syscall (98, FreeBSD ELF64, sys_connect), rip = 0x8008e9d8a, rsp = 0x7fffffffc0f8, rbp = 0x7fffffffc130 ---