Fix Style/Semicolon.

Library/.rubocop_todo.yml

@@ -281,13 +281,6 @@ Style/RegexpLiteral:
     - 'Homebrew/keg.rb'
     - 'Homebrew/version.rb'
 
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: AllowAsExpressionSeparator.
-Style/Semicolon:
-  Exclude:
-    - 'Homebrew/descriptions.rb'
-
 # Offense count: 2
 # Cop supports --auto-correct.
 # Configuration parameters: SupportedStyles.

Library/Homebrew/descriptions.rb

@@ -136,6 +136,6 @@ class Descriptions
 
   def short_name_counts
     @short_name_counts ||=
-      short_names.values.each_with_object(Hash.new(0)) { |name, counts| counts[name] += 1; counts }
+      short_names.values.each_with_object(Hash.new(0)) { |name, counts| counts[name] += 1 }
   end
 end