Merged revisions 243244 via svnmerge from

Merged revisions 243244 via svnmerge from
https://origsvn.digium.com/svn/asterisk/trunk

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  r243244 | jpeeler | 2010-01-26 12:07:57 -0600 (Tue, 26 Jan 2010) | 12 lines

  Fix crash resulting from frames with invalid data pointers.

  In ast_frdup the frame data union does not get set to point to malloced memory
  if the datalen is zero, so make sure to handle the same case in ast_frisolate
  appropriately.

  (closes issue #16058)
  Reported by: atis
  Patches:
        bug16058-fix.patch uploaded by jpeeler (license 325)
  Tested by: atis
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