Changeset b9478fc6 in rtems for VERSION

Patch from Eric Norum <eric@…>:

Some excellent sleuthing by Bob Wisdom <bobwis@…> revealed
that an empty mbuf at the end of a packet chain would cause the `retire'
function to blow up. Moving the line of code which bumps the transmit
buffer descriptor pointer fixes the problem. Some additional cleanup of
the sendpacket function was also completed.