Fix typo in script for archiving desugared library

Change-Id: I062ee8a704c30455e2eedea0cfcdfd0ace48cbdd
diff --git a/tools/archive_desugar_jdk_libs.py b/tools/archive_desugar_jdk_libs.py
index 10b300a..5298435 100755
--- a/tools/archive_desugar_jdk_libs.py
+++ b/tools/archive_desugar_jdk_libs.py
@@ -174,7 +174,7 @@
     version = GetVersion(
       os.path.join(
         checkout_dir,
-        VERSION_FILE_JDK11 if variant == 'jdk11' else VERSION_FILE_JDK8))
+        VERSION_FILE_JDK11 if options.variant == 'jdk11' else VERSION_FILE_JDK8))
 
     destination = archive.GetVersionDestination(
         'gs://', LIBRARY_NAME + '/' + version, is_main)