sprintf.c: remove magic numbers
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47213 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
sprintf.c: remove magic numbers
remove unused initial value.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47213 b2dd03c8-39d4-4d8f-98ff-823fe69b080e