bluetooth: bluecard_cs: Replace GFP_ATOMIC with GFP_KERNEL in bluecard_hci_set_baud_rate()

bluecard_hci_set_baud_rate() is never called in atomic context.

bluecard_hci_set_baud_rate() is only by bluecard_hci_open(), which is
set to hdev->open, and hdev->open() is never called in atomic context.

bluecard_hci_set_baud_rate() calls bt_skb_alloc() with GFP_ATOMIC,
which is not necessary. GFP_ATOMIC can be replaced with GFP_KERNEL.

This is found by a static analysis tool named DCNS written by myself.
I also manually check the kernel code before reporting it.
Signed-off-by: NJia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/bluecard_cs.c

@@ -565,7 +565,7 @@ static int bluecard_hci_set_baud_rate(struct hci_dev *hdev, int baud)
 	/* Ericsson baud rate command */
 	unsigned char cmd[] = { HCI_COMMAND_PKT, 0x09, 0xfc, 0x01, 0x03 };
 
-	skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
+	skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_KERNEL);
 	if (!skb) {
 		BT_ERR("Can't allocate mem for new packet");
 		return -1;