coverity_maint 419 B

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  1. o Code simplifications and refactoring:
  2. - Remove some dead code as indicated by coverity.
  3. - Remove a few dead assignments during router parsing. Found by coverity.
  4. o Minor bugfixes:
  5. - Add some forgotten return value checks during unit tests. Found
  6. by coverity.
  7. - Don't use 1-bit wide signed bit fields. Found by coverity.
  8. - Fix a rare memory leak during stats writing. Found by coverity.