Remove not used variable warnings from AM and AC

actionmailer/lib/action_mailer/base.rb

@@ -671,9 +671,8 @@ def mail(headers={}, &block)
       @_mail_was_called = true
       m = @_message
 
-      # At the beginning, do not consider class default for parts order neither content_type
+      # At the beginning, do not consider class default for content_type
       content_type = headers[:content_type]
-      parts_order  = headers[:parts_order]
 
       # Call all the procs (if any)
       class_default = self.class.default

actionpack/lib/action_controller/metal/redirecting.rb

@@ -74,7 +74,7 @@ def redirect_to(options = {}, response_status = {}) #:doc:
 
     private
       def _extract_redirect_to_status(options, response_status)
-        status = if options.is_a?(Hash) && options.key?(:status)
+        if options.is_a?(Hash) && options.key?(:status)
           Rack::Utils.status_code(options.delete(:status))
         elsif response_status.key?(:status)
           Rack::Utils.status_code(response_status[:status])