QEMU crashes when receiving network connection on NetBSD
Description of problem:
After booting the VM, connecting to the TCP port 2222 of the host immediately crashes the VM and qemu prints:

**
Slirp:ERROR:../slirp/src/tcp_subr.c:477:tcp_connect: assertion failed: (ret == 0)
Bail out! Slirp:ERROR:../slirp/src/tcp_subr.c:477:tcp_connect: assertion failed: (ret == 0)
Steps to reproduce:
1. start VM as indicated
2. telnet localhost 2222
3. crash
Additional information:
**
Slirp:ERROR:../slirp/src/tcp_subr.c:477:tcp_connect: assertion failed: (ret == 0)
Bail out! Slirp:ERROR:../slirp/src/tcp_subr.c:477:tcp_connect: assertion failed: (ret == 0)