Reverse order of args to fread.

This way, we don't always write a null byte into
byte 1 of the buffer

(closes issue #15905)
Reported by: ebroad
Patches:
      freadfix.patch uploaded by ebroad (license 878)
Tested by: ebroad



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@218933 65c4cc65-6c06-0410-ace0-fbb531ad65f3