oce.4: Add ifmedia(4) reference.
libc/getdevpath: Remove unneeded strlen().
kernel/oce: Fix wrong maxsegs argument for bus_dmamap_load_mbuf_segment().

Mindlessly introduced by me after it was tested by Mihai and led to a
panic.

I had misunderstood a comment by sephe. OCE_MAX_TX_ELEMENTS is (as the
name implies) just for the tx path.

Reported-by: Mihai Carabas <mihai.carabas@gmail.com>
vkernel - Fix frustrating VKE mac address bug

* Fix a very frustrating bug where VKE would sometimes ignore packets.
  It turns out that the default randomly-generated ether mac address
  was not being properly zero'd, leaving uninitialized locations in
  bytes 0 and 1 which would sometimes make the MAC look like a multicast
  address.

Reported-by: Frustrated tuxilo