rubocop fix for redundant self assignment

.rubocop_todo.yml

@@ -345,12 +345,6 @@ Style/RegexpLiteral:
     - 'spec/views/posts/index.html.haml_spec.rb'
     - 'spec/views/posts/show.html.haml_spec.rb'
 
-# Offense count: 1
-# Cop supports --auto-correct.
-Style/SelfAssignment:
-  Exclude:
-    - 'app/helpers/crops_helper.rb'
-
 # Offense count: 2
 # Cop supports --auto-correct.
 # Configuration parameters: SupportedStyles.

app/helpers/crops_helper.rb

@@ -5,7 +5,7 @@ module CropsHelper
     seeds = member.seeds.select { |seed| seed.crop.name == crop.name }
 
     seeds.each do |seed|
-      total_quantity = total_quantity + seed.quantity if seed.quantity
+      total_quantity += seed.quantity if seed.quantity
     end
 
     if !seeds.any?