class.c: adjust indent

* class.c (singleton_class_of): adjust indent.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40681 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
class.c: rb_singleton_class_get

* class.c (rb_singleton_class_get): get the singleton class if exists,
  or nil.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40682 b2dd03c8-39d4-4d8f-98ff-823fe69b080e