USB: omninet: fix potential tty NULL dereference

Add check for return value of tty_port_tty_get,
since it can return NULL after port hangup that may happen anytime.

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/omninet.c

@@ -185,11 +185,13 @@ static void omninet_read_bulk_callback(struct urb *urb)
 
 	if (urb->actual_length && header->oh_len) {
 		struct tty_struct *tty = tty_port_tty_get(&port->port);
+		if (tty) {
 			tty_insert_flip_string(tty, data + OMNINET_DATAOFFSET,
 							header->oh_len);
 			tty_flip_buffer_push(tty);
 			tty_kref_put(tty);
 		}
+	}
 
 	/* Continue trying to always read  */
 	result = usb_submit_urb(urb, GFP_ATOMIC);