Style: format code by gofumpt (#761)

transport/internet/tcp_hub.go

@@ -8,9 +8,7 @@ import (
 	"github.com/xtls/xray-core/common/net"
 )
 
-var (
-	transportListenerCache = make(map[string]ListenFunc)
-)
+var transportListenerCache = make(map[string]ListenFunc)
 
 func RegisterTransportListener(protocol string, listener ListenFunc) error {
 	if _, found := transportListenerCache[protocol]; found {
@@ -50,6 +48,7 @@ func ListenUnix(ctx context.Context, address net.Address, settings *MemoryStream
 	}
 	return listener, nil
 }
+
 func ListenTCP(ctx context.Context, address net.Address, port net.Port, settings *MemoryStreamConfig, handler ConnHandler) (Listener, error) {
 	if settings == nil {
 		s, err := ToMemoryStreamConfig(nil)