This patch fixes a bug in a unit test in func_math where a variable could be
passed to ast_free that wasn't allocated. This patch corrects the issue and
ensures that we only attempt to free a variable if we previously allocated
it.
Review: https://reviewboard.asterisk.org/r/4552
ASTERISK-24917
Reported by: dkdegroot
patches:
rb4552.patch submitted by dkdegroot (License 6600)
git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@434190 65c4cc65-6c06-0410-ace0-fbb531ad65f3