Bluetooth: btrtl: Correct the length of the HCI command for drop fw

The original code did not determine the length value of the HCI command
for drop fw even there's no parameter needed. In this commit, use struct
hci_command_hdr to manage opcode and length. It would be more regular and
more readable.
Suggested-by: Alex Lu <alex_lu@realsil.com.cn>
Signed-off-by: Max Chou <max.chou@realtek.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

drivers/bluetooth/btrtl.c

@@ -1044,12 +1044,11 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 	struct btrtl_device_info *btrtl_dev;
 	struct sk_buff *skb;
 	struct hci_rp_read_local_version *resp;
+	struct hci_command_hdr *cmd;
 	char cfg_name[40];
 	u16 hci_rev, lmp_subver;
 	u8 hci_ver, lmp_ver, chip_type = 0;
 	int ret;
-	u16 opcode;
-	u8 cmd[2];
 	u8 reg_val[2];
 
 	btrtl_dev = kzalloc(sizeof(*btrtl_dev), GFP_KERNEL);
@@ -1118,15 +1117,14 @@ struct btrtl_device_info *btrtl_initialize(struct hci_dev *hdev,
 		btrtl_dev->drop_fw = false;
 
 	if (btrtl_dev->drop_fw) {
-		opcode = hci_opcode_pack(0x3f, 0x66);
-		cmd[0] = opcode & 0xff;
-		cmd[1] = opcode >> 8;
-
-		skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
+		skb = bt_skb_alloc(sizeof(*cmd), GFP_KERNEL);
 		if (!skb)
 			goto err_free;
 
-		skb_put_data(skb, cmd, sizeof(cmd));
+		cmd = skb_put(skb, HCI_COMMAND_HDR_SIZE);
+		cmd->opcode = cpu_to_le16(0xfc66);
+		cmd->plen = 0;
+
 		hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
 
 		ret = hdev->send(hdev, skb);