cros_ec: Fix uninitialised variable in cros_ec.c

This fixes this cppcheck report:

[drivers/misc/cros_ec.c:704]: (error) Uninitialized variable: req

Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Wolfgang Denk <wd@denx.de>

drivers/misc/cros_ec.c

@@ -701,6 +701,7 @@ static int cros_ec_check_version(struct cros_ec_dev *dev)
 
 	/* Try sending a version 3 packet */
 	dev->protocol_version = 3;
+	req.in_data = 0;
 	if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
 			     (uint8_t **)&resp, sizeof(*resp)) > 0) {
 		return 0;