o Minor bugfixes:
    - Fix numerous warnings from the clang "scan-build" static analyzer.
      Some of these are programming style issues; some of them are false
      positives that indicated awkward code; some are undefined behavior
      cases related to constructing (but not using) invalid pointers;
      some are assumptions about API behavior; some are using
      sizeof(ptr) when sizeof(*ptr) would be correct; and one or two are
      genuine bugs that weren't reachable from the rest of the
      program. Fixes bug 8793; bugfixes on many, many tor versions.