Additional fix for broken ||= constant assignment

spec/google/api_client/batch_spec.rb

@@ -13,12 +13,11 @@
 # limitations under the License.
 
 require 'spec_helper'
-
 require 'google/api_client'
 require 'google/api_client/version'
 
 describe Google::APIClient::BatchRequest do
-  CLIENT ||= Google::APIClient.new
+  CLIENT = Google::APIClient.new unless defined?(CLIENT)
 
   after do
     # Reset client to not-quite-pristine state