Merged revisions 212574 via svnmerge from

Merged revisions 212574 via svnmerge from
https://origsvn.digium.com/svn/asterisk/trunk

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  r212574 | seanbright | 2009-08-17 14:18:16 -0400 (Mon, 17 Aug 2009) | 8 lines

  Correct the return value check for ast_safe_system.

  The logic here was reversed as ast_safe_system returns -1 on error and not on
  success.  Fix suggested by reporter.

  (closes issue #15667)
  Reported by: loic
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.1@212579 65c4cc65-6c06-0410-ace0-fbb531ad65f3