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