Revert "tty:n_gsm.c: destroy port by tty_port_destroy()"

This reverts commit 7726fb53e75fa48714181efd00167e0734303afb.

Jiri writes:
On 24. 09. 19, 11:25, Xiaoming Ni wrote:
> According to the comment of tty_port_destroy():
> When a port was initialized using tty_port_init, one has to destroy
> the port by tty_port_destroy();

It continues with a part saying:
Either indirectly by using tty_port refcounting
(tty_port_put) or directly if refcounting is not used.

So this should be reverted.

Cc: Xiaoming Ni <[e-mail]>
Reported-by: Jiri Slaby <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/n_gsm.c

···
 
 	del_timer_sync(&dlci->t1);
 	dlci->gsm->dlci[dlci->addr] = NULL;
-	tty_port_destroy(&dlci->port);
 	kfifo_free(dlci->fifo);
 	while ((dlci->skb = skb_dequeue(&dlci->skb_list)))
 		dev_kfree_skb(dlci->skb);