Fix resolver_gce_integration_tests_defs.include to pass shellcheck
diff --git a/templates/test/cpp/naming/resolver_gce_integration_tests_defs.include b/templates/test/cpp/naming/resolver_gce_integration_tests_defs.include
index 2413ec5..0cb8a1b 100644
--- a/templates/test/cpp/naming/resolver_gce_integration_tests_defs.include
+++ b/templates/test/cpp/naming/resolver_gce_integration_tests_defs.include
@@ -24,7 +24,7 @@
   exit 1
 fi
 
-cd $(dirname $0)/../../..
+cd "$(dirname "$0")/../../.."
 
 if [[ "$CONFIG" == "" ]]; then
   export CONFIG=opt