tty: max310x: fix flexible_array.cocci warnings

Zero-length and one-element arrays are deprecated, see
Documentation/process/deprecated.rst
Flexible-array members should be used instead.

Generated by: scripts/coccinelle/misc/flexible_array.cocci

Fixes: 10d8b34a ("serial: max310x: Driver rework")
CC: Denis Efremov <efremov@linux.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
Signed-off-by: Julia Lawall <julia.lawall@inria.fr>
Link: https://lore.kernel.org/r/alpine.DEB.2.22.394.2103091516020.2892@hadrienSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/max310x.c

@@ -273,7 +273,7 @@ struct max310x_port {
 #ifdef CONFIG_GPIOLIB
 	struct gpio_chip	gpio;
 #endif
-	struct max310x_one	p[0];
+	struct max310x_one	p[];
 };
 
 static struct uart_driver max310x_uart = {