messages on the routing socket have different headers - rt_msghdr,

if_msghdr, etc. they only share the first 3 fields, and then differ.
this leads to a bug in RTM_IFINFO handling. We did abort on
rtm->rtm_errno != 0,
but if_msghdr has no errno, so we look at something in the data part
instead. Surprising that this didn't bite us before!
So we must only do these checks for RTM_ADD/CHANGE/DELETE that actually
use rt_msghdr.
found whiel checking strange behaviour tony sarendal <dualcyclone@gmail.com>
saw, and then totally strange behaviour on my amd64 hackbox. claudio ok

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