A shallow pointer copy was causing an ast_party_connected_line
structure to be freed multiple times, thus causing a crash.

(closes issue #15441)
Reported by: lmsteffan
Patches:
      15441.patch uploaded by mmichelson (license 60)
Tested by: lmsteffan	  



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@208017 65c4cc65-6c06-0410-ace0-fbb531ad65f3