Segfault in `ipv6nd.c`

[lima-limon-inc]

I've been having ocasional segfaults on dhcpcd. I couldn't pinpoint the issue yet, but I do believe it only happens when I have docker running.
I've enabled a core dump and it appears that the segfault occurred on this line:

	if (ifp->ctx->ra_routers == NULL)
		return;

Link to the file.

Maybe this is related to #566

OS: Gentoo Linux
Arch: x86_64
dhcpcd version: 10.3.2