serial: liteuart: clean up rx loop variables

The `status` variable will always be `1` when passed into the call
to `uart_insert_char()`, so it can be eliminated altogether.

Use `u8` as the type for `ch`, as it matches the return type of
the `litex_read8()` call which produces its value.
Signed-off-by: Gabriel Somlo <gsomlo@gmail.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20221123130500.1030189-10-gsomlo@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/liteuart.c

@@ -73,10 +73,9 @@ static void liteuart_timer(struct timer_list *t)
 	struct liteuart_port *uart = from_timer(uart, t, timer);
 	struct uart_port *port = &uart->port;
 	unsigned char __iomem *membase = port->membase;
-	int ch;
-	unsigned long status;
+	u8 ch;
 
-	while ((status = !litex_read8(membase + OFF_RXEMPTY)) == 1) {
+	while (!litex_read8(membase + OFF_RXEMPTY)) {
 		ch = litex_read8(membase + OFF_RXTX);
 		port->icount.rx++;
 
@@ -85,7 +84,7 @@ static void liteuart_timer(struct timer_list *t)
 
 		/* no overflow bits in status */
 		if (!(uart_handle_sysrq_char(port, ch)))
-			uart_insert_char(port, status, 0, ch, TTY_NORMAL);
+			uart_insert_char(port, 1, 0, ch, TTY_NORMAL);
 	}
 
 	tty_flip_buffer_push(&port->state->port);