ACPI: PMIC: Use sizeof() instead of hard coded value

It's better to use sizeof() of a given buffer than spreading
a hard coded value.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/pmic/intel_pmic_chtdc_ti.c

@@ -87,7 +87,7 @@ static int chtdc_ti_pmic_get_raw_temp(struct regmap *regmap, int reg)
 {
 	u8 buf[2];
 
-	if (regmap_bulk_read(regmap, reg, buf, 2))
+	if (regmap_bulk_read(regmap, reg, buf, sizeof(buf)))
 		return -EIO;
 
 	/* stored in big-endian */

drivers/acpi/pmic/intel_pmic_xpower.c

@@ -255,7 +255,7 @@ static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
 	if (ret)
 		return ret;
 
-	ret = regmap_bulk_read(regmap, AXP288_GP_ADC_H, buf, 2);
+	ret = regmap_bulk_read(regmap, AXP288_GP_ADC_H, buf, sizeof(buf));
 	if (ret == 0)
 		ret = (buf[0] << 4) + ((buf[1] >> 4) & 0x0f);