removed useless assignments at some places

app/models/discourse_single_sign_on.rb

@@ -92,7 +92,7 @@ class DiscourseSingleSignOn < SingleSignOn
         sso_record.last_payload = unsigned_payload
         sso_record.external_id = external_id
       else
-        sso_record = user.create_single_sign_on_record(last_payload: unsigned_payload,
+        user.create_single_sign_on_record(last_payload: unsigned_payload,
                                           external_id: external_id,
                                           external_username: username,
                                           external_email: email,

app/models/invite_redeemer.rb

@@ -99,7 +99,7 @@ InviteRedeemer = Struct.new(:invite, :username, :name) do
   end
 
   def approve_account_if_needed
-    invited_user.approve(invite.invited_by_id, send_email=false)
+    invited_user.approve(invite.invited_by_id, false)
   end
 
   def notify_invitee

app/models/plugin_store.rb

@@ -8,7 +8,7 @@ class PluginStore
 
   def self.set(plugin_name, key, value)
     hash = {plugin_name: plugin_name, key: key}
-    row = PluginStoreRow.find_by(hash) || row = PluginStoreRow.new(hash)
+    row = PluginStoreRow.find_by(hash) || PluginStoreRow.new(hash)
 
     row.type_name = determine_type(value)
     # nil are stored as nil

app/models/topic_embed.rb

@@ -151,7 +151,7 @@ class TopicEmbed < ActiveRecord::Base
   def self.expanded_for(post)
     Rails.cache.fetch("embed-topic:#{post.topic_id}", expires_in: 10.minutes) do
       url = TopicEmbed.where(topic_id: post.topic_id).pluck(:embed_url).first
-      title, body = TopicEmbed.find_remote(url)
+      _title, body = TopicEmbed.find_remote(url)
       body << TopicEmbed.imported_from_html(url)
       body
     end

app/models/user.rb

@@ -173,7 +173,6 @@ class User < ActiveRecord::Base
   end
 
   def change_username(new_username)
-    current_username = self.username
     self.username = new_username
     save
   end

lib/cooked_post_processor.rb

@@ -69,7 +69,7 @@ class CookedPostProcessor
     @doc.css("img[src^='data']") -
     # minus, image inside oneboxes
     oneboxed_images -
-    # minux, images inside quotes
+    # minus, images inside quotes
     @doc.css(".quote img")
   end