digest.c: raise exception on init failure
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46826 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
digest.c: raise exception on init failure
indicate success or failure; raise exception on failure.
[ruby-core:61614] [Bug #9659]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46826 b2dd03c8-39d4-4d8f-98ff-823fe69b080e