Correct "return cant jump across threads" error when using check_auth…

…orization()

lib/cancan/controller_additions.rb

@@ -247,9 +247,9 @@ def skip_authorize_resource(*args)
       #
       def check_authorization(options = {})
         self.after_filter(options.slice(:only, :except)) do |controller|
-          return if controller.instance_variable_defined?(:@_authorized)
-          return if options[:if] && !controller.send(options[:if])
-          return if options[:unless] && controller.send(options[:unless])
+          next if controller.instance_variable_defined?(:@_authorized)
+          next if options[:if] && !controller.send(options[:if])
+          next if options[:unless] && controller.send(options[:unless])
           raise AuthorizationNotPerformed, "This action failed the check_authorization because it does not authorize_resource. Add skip_authorization_check to bypass this check."
         end
       end