nobu 6f0de6ed98 error.c: check redefined backtrace result
* error.c (rb_get_backtrace): check the result of `backtrace` even
  if the method is redefined.  [ruby-core:87013] [Bug #14756]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63417 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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