chore: Remove unnecessary `if` in httpupgrade (#3413)

transport/internet/httpupgrade/hub.go

@@ -78,12 +78,8 @@ func (s *server) Handle(conn net.Conn) (stat.Connection, error) {
 			Port: int(0),
 		}
 	}
-	if remoteAddr == nil {
-		return nil, newError("remoteAddr is nil")
-	}
 
-	conn = newConnection(conn, remoteAddr)
-	return stat.Connection(conn), nil
+	return stat.Connection(newConnection(conn, remoteAddr)), nil
 }
 
 func (s *server) keepAccepting() {