tty: pdc_cons, free tty_driver upon failure

pdc_console_tty_driver_init() does not free the allocated tty driver in
case tty_register_driver() fails. Add one tty_driver_kref_put() to the
error path.

Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210723074317.32690-9-jslaby@suse.czSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/parisc/kernel/pdc_cons.c

@@ -181,6 +181,7 @@ static int __init pdc_console_tty_driver_init(void)
 	if (err) {
 		printk(KERN_ERR "Unable to register the PDC console TTY driver\n");
 		tty_port_destroy(&tty_port);
+		tty_driver_kref_put(driver);
 		return err;
 	}