amiserial: remove unused state from shutdown

'state' variable is only set but never read in amiserial's shutdown.
Drop it.

It was like this since the driver was added to the tree as far as I can
tell.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210714091314.8292-11-jslaby@suse.czSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/amiserial.c

@@ -517,13 +517,10 @@ static int startup(struct tty_struct *tty, struct serial_state *info)
 static void shutdown(struct tty_struct *tty, struct serial_state *info)
 {
 	unsigned long	flags;
-	struct serial_state *state;
 
 	if (!tty_port_initialized(&info->tport))
 		return;
 
-	state = info;
-
 #ifdef SERIAL_DEBUG_OPEN
 	printk("Shutting down serial port %d ....\n", info->line);
 #endif