fix lint

pkg/geoip/emptyProvider.go

@@ -5,21 +5,30 @@ import (
 	"net"
 )
 
+// EmptyProvider is a no-op GeoIP backend used before a real provider is configured.
 type EmptyProvider struct{}
 
+// Name returns the provider identifier.
 func (e *EmptyProvider) Name() string {
 	return "EmptyProvider"
 }
 
+// Initialize prepares the empty provider for use.
 func (e *EmptyProvider) Initialize() error {
 	return nil
 }
-func (e *EmptyProvider) GetGeoInfo(ip net.IP) (*GeoInfo, error) {
+
+// GetGeoInfo reports that no GeoIP provider has been configured.
+func (e *EmptyProvider) GetGeoInfo(_ net.IP) (*GeoInfo, error) {
 	return nil, fmt.Errorf("you are using an empty GeoIP provider, please set a valid provider")
 }
+
+// UpdateDatabase reports that no GeoIP provider has been configured.
 func (e *EmptyProvider) UpdateDatabase() error {
 	return fmt.Errorf("you are using an empty GeoIP provider, please set a valid provider")
 }
+
+// Close releases resources held by the empty provider.
 func (e *EmptyProvider) Close() error {
 	return nil
 }