hwmon: (cros_ec) Fix access to restricted __le16

0-day complains:

drivers-hwmon-cros_ec_hwmon.c:sparse:sparse:cast-to-restricted-__le16

Fix by using a __le16 typed variable as parameter to le16_to_cpu().

Fixes: bc3e45258096 ("hwmon: add ChromeOS EC driver")
Cc: Thomas Weißschuh <[e-mail]>
Cc: Tzung-Bi Shih <[e-mail]>
Signed-off-by: Guenter Roeck <[e-mail]>
Acked-by: Thomas Weißschuh <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Tzung-Bi Shih <[e-mail]>

drivers/hwmon/cros_ec_hwmon.c

···
 static int cros_ec_hwmon_read_fan_speed(struct cros_ec_device *cros_ec, u8 index, u16 *speed)
 {
 	int ret;
+	__le16 __speed;
 
-	ret = cros_ec_cmd_readmem(cros_ec, EC_MEMMAP_FAN + index * 2, 2, speed);
+	ret = cros_ec_cmd_readmem(cros_ec, EC_MEMMAP_FAN + index * 2, 2, &__speed);
 	if (ret < 0)
 		return ret;
 
-	*speed = le16_to_cpu(*speed);
+	*speed = le16_to_cpu(__speed);
 	return 0;
 }