Fix minor bug that was causing tbswap to return bad exit code, that swapexp took to mean the experiment was swapped. I hate 8 bits of status!
Fix minor bug that was causing tbswap to return bad exit code, that
swapexp took to mean the experiment was swapped. I hate 8 bits of
status!

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome