slirp: Fix error reported by static code analysis

Report from smatch:

slirp/tcp_subr.c:127 tcp_respond(17) error:
 we previously assumed 'tp' could be null (see line 124)

Return if 'tp' is NULL.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/tcp_subr.c b/tcp_subr.c
index ae319d9..d55259e 100644
--- a/tcp_subr.c
+++ b/tcp_subr.c
@@ -121,7 +121,7 @@ void tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m,
     if (tp)
         win = sbspace(&tp->t_socket->so_rcv);
     if (m == NULL) {
-        if ((m = m_get(tp->t_socket->slirp)) == NULL)
+        if (!tp || (m = m_get(tp->t_socket->slirp)) == NULL)
             return;
         tlen = 0;
         m->m_data += IF_MAXLINKHDR;