- Log all the problems in devfs_fixup().
- Log all the problems in devfs_fixup().

- Correct error paths. The system will be useless on devfs_fixup() failure, so
  why bother?  Maybe for the same reason why a dead body is washed and dressed
  in a nice suit before it is put into a coffin? Maybe system's last will is to
  panic without any locks held?

Reviewed by:	kib

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase