Remove explicit return and avoid creating local var.

activerecord/lib/active_record/associations/has_many_association.rb

@@ -112,8 +112,7 @@ module ActiveRecord
         end
 
         def we_can_set_the_inverse_on_this?(record)
-          inverse = @reflection.inverse_of
-          return !inverse.nil?
+          !@reflection.inverse_of.nil?
         end
     end
   end