Clang will flag errors when a char pointer is set to '\0', as opposed to a
value that the char pointer points to. This patch fixes this warning
in a variety of locations.
Review: https://reviewboard.asterisk.org/r/4551
ASTERISK-24917
Reported by: dkdegroot
patches:
rb4551.patch submitted by dkdegroot (License 6600)
git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@434187 65c4cc65-6c06-0410-ace0-fbb531ad65f3