Remove redundant (#9503)

app/services/pubsubhubbub/subscribe_service.rb

@@ -19,31 +19,18 @@ class Pubsubhubbub::SubscribeService < BaseService
   private
 
   def process_subscribe
-    case subscribe_status
-    when :invalid_topic
+    if account.nil?
       ['Invalid topic URL', 422]
-    when :invalid_callback
+    elsif !valid_callback?
       ['Invalid callback URL', 422]
-    when :callback_not_allowed
+    elsif blocked_domain?
       ['Callback URL not allowed', 403]
-    when :valid
+    else
       confirm_subscription
       ['', 202]
     end
   end
 
-  def subscribe_status
-    if account.nil?
-      :invalid_topic
-    elsif !valid_callback?
-      :invalid_callback
-    elsif blocked_domain?
-      :callback_not_allowed
-    else
-      :valid
-    end
-  end
-
   def confirm_subscription
     subscription = locate_subscription
     Pubsubhubbub::ConfirmationWorker.perform_async(subscription.id, 'subscribe', secret, lease_seconds)