Merged revisions 135915 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r135915 | tilghman | 2008-08-05 22:24:56 -0500 (Tue, 05 Aug 2008) | 4 lines

Since powerof() can return an error condition, it's foolhardy not to detect and
deal with that condition.
(Related to issue #13240)

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