[Bug 273557] Regression preventing bhyve from running inside a jail without IP after f74147e26999838e03a522bf59ea33bef470d356) breaks support for jailing bhyve with IPv4 and IPv6 disabled. Patch included.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273557

--- Comment #5 from crest@rlwinm.de ---
(In reply to Bjoern A. Zeeb from comment #3)

I've seen that the ioctl() does implicitly bitwise-or in the IFF_UP flag, but
it felt cleaner to explicitly request this instead of relying on this
undocumented implementation detail. I confirmed it even brings the interface up
if a NULL pointer is passed as argument to the ioctl(), but again that would be
an ugly workaround. I agree that it would've been better to make this optional
or even check the interface link state before overwriting it and only refusing
to start the guest if the link can't be brought up, but I don't see any
situation where the current implementation of the VMIO_SIOCSIFFLAGS ioctl()
would fail on an opened tap device so the error handling code is unreachable on
FreeBSD releng/13.2 and stable/14.

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