Fix for golangci-lint warning
Fix for golangci-lint warning

Signed-off-by: Tyler Reid <ffa77ea8e61c15497ded07e884523c037dee456f@grafana.com>

prometheus/alertmanager,prometheus/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,prometheus/alertmanager,GoogleCloudPlatform/alertmanager,GoogleCloudPlatform/alertmanager,GoogleCloudPlatform/alertmanager