Remove explicit return.

Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb

@@ -67,7 +67,7 @@ def insert_record(record, force = true, validate = true)
             relation.insert(attributes)
           end
 
-          return true
+          true
         end
 
         def delete_records(records)
@@ -80,7 +80,7 @@ def delete_records(records)
             ).delete
           end
         end
-        
+
         def construct_joins
           "INNER JOIN #{@owner.connection.quote_table_name @reflection.options[:join_table]} ON #{@reflection.quoted_table_name}.#{@reflection.klass.primary_key} = #{@owner.connection.quote_table_name @reflection.options[:join_table]}.#{@reflection.association_foreign_key}"
         end