switch a couple of operands.

This gives slightly different results from the previous code
on syntax errors, but it actually makes fewer mistakes so
i think it is an improvement. Additionally, it makes the
code more uniform (the other call of reset_argcount
occurs after LP and not before).
 


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@23783 65c4cc65-6c06-0410-ace0-fbb531ad65f3