fix staticcheck failures of test/e2e/manifest

Author: SataQiu

hack/.staticcheck_failures

@@ -66,7 +66,6 @@ test/e2e/apps
 test/e2e/autoscaling
 test/e2e/instrumentation/logging/stackdriver
 test/e2e/instrumentation/monitoring
-test/e2e/manifest
 test/images/agnhost/dns
 test/images/agnhost/inclusterclient
 test/images/agnhost/net/nat

test/e2e/manifest/manifest.go

@@ -166,6 +166,9 @@ func DaemonSetFromManifest(fileName, ns string) (*appsv1.DaemonSet, error) {
 func RoleFromManifest(fileName, ns string) (*rbacv1.Role, error) {
 	var role rbacv1.Role
 	data, err := testfiles.Read(fileName)
+	if err != nil {
+		return nil, err
+	}
 
 	json, err := utilyaml.ToJSON(data)
 	if err != nil {