w1: gpio: Use sizeof(*pointer) instead of sizeof(type)

It is preferred to use sizeof(*pointer) instead of sizeof(type).
The type of the variable can change and one needs not change
the former (unlike the latter). No functional change intended.

Signed-off-by: Andy Shevchenko <[e-mail]>
Acked-by: Uwe Kleine-König <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

drivers/w1/masters/w1-gpio.c

···
 	if (device_property_present(dev, "linux,open-drain"))
 		gflags = GPIOD_OUT_LOW;
 
-	master = devm_kzalloc(dev, sizeof(struct w1_bus_master),
-			GFP_KERNEL);
+	master = devm_kzalloc(dev, sizeof(*master), GFP_KERNEL);
 	if (!master)
 		return -ENOMEM;