object.c: fix r44189
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44190 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
object.c: fix r44189
valid nested class path.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44190 b2dd03c8-39d4-4d8f-98ff-823fe69b080e