platform/chrome: cros_ec_proto: remove redundant NULL check

send_command() already checks if `ec_dev->pkt_xfer` is NULL.  Remove the
redundant check.
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20220609084957.3684698-6-tzungbi@kernel.org

drivers/platform/chrome/cros_ec_proto.c

@@ -281,9 +281,6 @@ static int cros_ec_host_command_proto_query(struct cros_ec_device *ec_dev,
 	 */
 	int ret;
 
-	if (!ec_dev->pkt_xfer)
-		return -EPROTONOSUPPORT;
-
 	memset(msg, 0, sizeof(*msg));
 	msg->command = EC_CMD_PASSTHRU_OFFSET(devidx) | EC_CMD_GET_PROTOCOL_INFO;
 	msg->insize = sizeof(struct ec_response_get_protocol_info);