Review coverity build warnings
Coverity emits a big pile of build warnings because of our BUG macro. Let's see if we can fix that. They look like this:
"/home/torcoverity/src/tor/cov-int/emit/totoro.wangafu.net/config/fc74ea42bbd56
ee35d2b17ca574b8e9b/gcc-config-0/coverity-compiler-compat.h", line
1627: warning #41: expression must have arithmetic or pointer type
#nodef BUG() __coverity_panic__()
Also, there are quite a few of these:
"src/common/util.c", line 1169: warning #1563: function "tor_parse_long" not
emitted, consider modeling it or review parse diagnostics to improve
fidelity
tor_parse_long(const char *s, int base, long min, long max,