tty: max310x: fix off-by-one buffer access when storing overrun

A recent change split the insertion loop into two parts. The first part
accessed bytes 0, 1, ... (rxlen - 2), and the second part by mistake
took offset `rxlen` instead of the correct `rxlen - 1`. So one byte was
not stored, and the final access wrote past the end of the rx_buf.

Fixes: 9c12d739d6 (tty: max310x: Split uart characters insertion loop)
Signed-off-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/13ea227620aaad8a7231d42ed03a8508297d4eb3.1567027079.git.jan.kundrat@cesnet.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/max310x.c

@@ -689,7 +689,7 @@ static void max310x_handle_rx(struct uart_port *port, unsigned int rxlen)
 		 * tail.
 		 */
 		uart_insert_char(port, sts, MAX310X_LSR_RXOVR_BIT,
-				 one->rx_buf[rxlen], flag);
+				 one->rx_buf[rxlen-1], flag);
 
 	} else {
 		if (unlikely(rxlen >= port->fifosize)) {