Merged revisions 293803 via svnmerge from

Merged revisions 293803 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r293803 | twilson | 2010-11-03 11:05:14 -0700 (Wed, 03 Nov 2010) | 25 lines

  Avoid valgrind warnings for ast_rtp_instance_get_xxx_address

  The documentation for ast_rtp_instance_get_(local/remote)_address stated that
  they returned 0 for success and -1 on failure. Instead, they returned 0 if the
  address structure passed in was already equivalent to the address instance
  local/remote address or 1 otherwise. 90% of the calls to these functions
  completely ignored the return address and passed in an uninitialized struct,
  which would make valgrind complain even though the operation was technically
  safe.

  This patch fixes the documentation and converts the get_xxx_address functions
  to void since all they really do is copy the address and cannot fail.
  Additionally two new functions
  (ast_rtp_instance_get_and_cmp_(local/remote)_address) are created for the 3
  times where the return value was actually checked. The
  get_and_cmp_local_address function is currently unused, but exists for the sake
  of symmetry.

  The only functional change as a result of this change is that we will not do an
  ast_sockaddr_cmp() on (mostly uninitialized) addresses before doing the
  ast_sockaddr_copy() in the get_*_address functions. So, even though it is an
  API change, it shouldn't have a noticeable change in behavior.

  Review: https://reviewboard.asterisk.org/r/995/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@293809 65c4cc65-6c06-0410-ace0-fbb531ad65f3