digest.c: call to_s once
to_s
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46371 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
digest.c: call to_s once
to_stwice. [Bug #9913]git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46371 b2dd03c8-39d4-4d8f-98ff-823fe69b080e