p2p: initialize maps with known size (#27229)

p2p/discover/table_util_test.go

@@ -175,7 +175,7 @@ func (t *pingRecorder) RequestENR(n *enode.Node) (*enode.Node, error) {
 }
 
 func hasDuplicates(slice []*node) bool {
-	seen := make(map[enode.ID]bool)
+	seen := make(map[enode.ID]bool, len(slice))
 	for i, e := range slice {
 		if e == nil {
 			panic(fmt.Sprintf("nil *Node at %d", i))

p2p/discover/v5_udp_test.go

@@ -198,7 +198,7 @@ func TestUDPv5_findnodeHandling(t *testing.T) {
 }
 
 func (test *udpV5Test) expectNodes(wantReqID []byte, wantTotal uint8, wantNodes []*enode.Node) {
-	nodeSet := make(map[enode.ID]*enr.Record)
+	nodeSet := make(map[enode.ID]*enr.Record, len(wantNodes))
 	for _, n := range wantNodes {
 		nodeSet[n.ID()] = n.Record()
 	}