* when the variable is set to `NULL` right after freeing
* when the variable is checked for non-`NULL` before freeing
* when the variable is a global (because they should be set to `NULL`, even if we don't really claim that things can be re-init'd)
Testing Done:
Compiled, and ran tests in valgrind.
Reviewed at https://reviews.imfreedom.org/r/2369/
# UPDATING VERSION NUMBERS FOR RELEASES
#
# The version number is:
# <major>.<minor>.<micro><extra>
#
# micro += 1
#
# If any functions have been added to libpurple, Pidgin, or Finch:
# micro = 0
# minor += 1
#
# If backwards compatibility has been broken in libpurple, Pidgin, or Finch:
# micro = 0
# minor = 0
# major += 1
# purple_soversion += 1
#
# extra should be similar to one of the following: