all: remove redundant conversions and import names (#21903)

p2p/enode/nodedb.go

@@ -163,7 +163,7 @@ func splitNodeItemKey(key []byte) (id ID, ip net.IP, field string) {
 	}
 	key = key[len(dbDiscoverRoot)+1:]
 	// Split out the IP.
-	ip = net.IP(key[:16])
+	ip = key[:16]
 	if ip4 := ip.To4(); ip4 != nil {
 		ip = ip4
 	}