LibCore: close socket on TCPServer dtor

Author: https://github.com/tryfinally
Commit: https://github.com/SerenityOS/serenity/commit/9150f3c266b
Pull-request: https://github.com/SerenityOS/serenity/pull/3045
Reviewed-by: https://github.com/elcuco

Libraries/LibCore/TCPServer.cpp

@@ -53,6 +53,7 @@ TCPServer::TCPServer(Object* parent)
 
 TCPServer::~TCPServer()
 {
+    ::close(m_fd);
 }
 
 bool TCPServer::listen(const IPv4Address& address, u16 port)