chore: do not add an unnecessary fmt.Sprintf()

plugins/scheduler-k3s/functions.go

@@ -1436,7 +1436,7 @@ func getServerIP() (string, error) {
 	}
 
 	if len(serverIP) == 0 {
-		return "", fmt.Errorf(fmt.Sprintf("Unable to determine server ip address from network-interface %s", networkInterface))
+		return "", fmt.Errorf("Unable to determine server ip address from network-interface %s", networkInterface)
 	}
 	return serverIP, nil
 }