i2c: mux: gpio: Use array_size() helper

Use array_size() helper to aid in 2-factor allocation instances.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Evan Green <evgreen@chromium.org>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/muxes/i2c-mux-gpio.c

@@ -7,6 +7,7 @@
 
 #include <linux/i2c.h>
 #include <linux/i2c-mux.h>
+#include <linux/overflow.h>
 #include <linux/platform_data/i2c-mux-gpio.h>
 #include <linux/platform_device.h>
 #include <linux/module.h>
@@ -152,7 +153,7 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
 		return -EPROBE_DEFER;
 
 	muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
-			     ngpios * sizeof(*mux->gpios), 0,
+			     array_size(ngpios, sizeof(*mux->gpios)), 0,
 			     i2c_mux_gpio_select, NULL);
 	if (!muxc) {
 		ret = -ENOMEM;