x86: apuv2: remove unused variable

The driver was newly introduced but the version that got merged
produces a harmless compiler warning:

drivers/platform/x86/pcengines-apuv2.c: In function 'apu_board_init':
drivers/platform/x86/pcengines-apuv2.c:211:6: error: unused variable 'rc' [-Werror=unused-variable]

Remove the evidently useless variable.

Fixes: f8eb0235 ("x86: pcengines apuv2 gpio/leds/keys platform driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-By: Enrico Weigelt, metux IT consult <info@metux.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/platform/x86/pcengines-apuv2.c

@@ -208,7 +208,6 @@ static struct platform_device * __init apu_create_pdev(
 
 static int __init apu_board_init(void)
 {
-	int rc;
 	const struct dmi_system_id *id;
 
 	id = dmi_first_match(apu_gpio_dmi_table);