use errchk in more places.
let errchk exit 0 even if it has reported a BUG.
it echoed BUG and that's all that matters.

R=r
DELTA=143  (1 added, 89 deleted, 53 changed)
OCL=32533
CL=32542
20 files changed
tree: 413365520b2fa7535b11aeeeedba7ca625287e66
  1. doc/
  2. include/
  3. lib/
  4. misc/
  5. pkg/
  6. src/
  7. test/
  8. usr/