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ext/digest: return values of init and final

• ext/digest: make built-in digest function implementations
  indicate success or failure of init and final functions.
  [ruby-core:61614] [Bug #9659]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46827 b2dd03c8-39d4-4d8f-98ff-823fe69b080e