power: supply: cros_usbpd: Use struct_size() helper in kzalloc()

Make use of the struct_size() helper instead of an open-coded version, in order to avoid any potential type mistakes or integer overflows that, in the worst scenario, could lead to heap overflows.

Also, address the following sparse warnings:
drivers/power/supply/cros_usbpd-charger.c:107:23: warning: using sizeof on a flexible structure

---
 drivers/power/supply/cros_usbpd-charger.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index d89e08efd2ad..cadb6a0c2cc7 100644
@@ -104,7 +104,7 @@ static int cros_usbpd_charger_ec_command(struct charger_data *charger,
 	struct cros_ec_command *msg;
 	int ret;
 
-	msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
+	msg = kzalloc(struct_size(msg, data, max(outsize, insize)), GFP_KERNEL);
 	if (!msg)
 		return -ENOMEM;
 

2.27.0