Merged revisions 331265 via svnmerge from

Merged revisions 331265 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/10

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  r331265 | rmudgett | 2011-08-09 18:12:49 -0500 (Tue, 09 Aug 2011) | 22 lines

  Merged revisions 331248 via svnmerge from
  https://origsvn.digium.com/svn/asterisk/branches/1.8

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    r331248 | rmudgett | 2011-08-09 17:12:59 -0500 (Tue, 09 Aug 2011) | 15 lines

    Misc minor items found in code.

    * Add some reentrancy protection in pbx.c when creating the contexts_table
    hash table.

    * Fix inverted test in chan_sip.c conditional code.

    * Fix uninitialized variable and use of the wrong variable in chan_iax2.c.

    * Fix test of return value in app_parkandannounce.c.  Explicitly testing
    for -1 is bad if the function does not actually return that value when it
    fails.

    * Fixup some comments and add some curly braces in features.c.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@331266 65c4cc65-6c06-0410-ace0-fbb531ad65f3