all: fix ineffectual assignments and remove uses of crypto.Sha3

go get github.com/gordonklaus/ineffassign
ineffassign .

cmd/geth/monitorcmd.go

@@ -236,8 +236,9 @@ func expandMetrics(metrics map[string]interface{}, path string) []string {
 
 // fetchMetric iterates over the metrics map and retrieves a specific one.
 func fetchMetric(metrics map[string]interface{}, metric string) float64 {
-	parts, found := strings.Split(metric, "/"), true
+	parts := strings.Split(metric, "/")
 	for _, part := range parts[:len(parts)-1] {
+		var found bool
 		metrics, found = metrics[part].(map[string]interface{})
 		if !found {
 			return 0