digest: remove optional parameter from OpenSSL::Digest#finish #825
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OpenSSL::Digest#finish overrides Digest::Instance#finish and is called from the Digest::Class framework in the digest library. This method is not supposed to take any arguments, as suggested by the RDoc comment for Digest::Instance#finish.
It is a private method and not exposed to users. Let's remove it.
This optional parameter has been there since r15602 in Ruby trunk, which converted OpenSSL::Digest to the current state, a subclass of Digest::Class.