Don't set the full command string until after verifying that there is not

another CLI command with the same command text registered.  This prevents
a crash if someone accidentally calls ast_cli_register()  on the same CLI
command data twice.  This also fixes a small bug where the helpers list
would get unlocked without being locked if building the full command failed.
(closes issue #10858, reported by jamesgolovich, patched by me)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@84169 65c4cc65-6c06-0410-ace0-fbb531ad65f3