Bluetooth: Fix incorrect strncpy() in hidp_setup_hid()

The length parameter should be sizeof(req->name) - 1 because there is no
guarantee that string provided by userspace will contain the trailing
'\0'.

Can be easily reproduced by manually setting req->name to 128 non-zero
bytes prior to ioctl(HIDPCONNADD) and checking the device name setup on
input subsystem:

$ cat /sys/devices/pnp0/00\:04/tty/ttyS0/hci0/hci0\:1/input8/name
AAAAAA[...]AAAAAAAAf0:af:f0:af:f0:af

("f0:af:f0:af:f0:af" is the device bluetooth address, taken from "phys"
field in struct hid_device due to overflow.)

Cc: stable@vger.kernel.org
Signed-off-by: Anderson Lizardo <anderson.lizardo@openbossa.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
static void hidp_process_ctrl_transmit(struct hidp_session *session)
{
	struct sk_buff *skb;

	BT_DBG("session %p", session);

	while ((skb = skb_dequeue(&session->ctrl_transmit))) {
		if (hidp_send_frame(session->ctrl_sock, skb->data, skb->len) < 0) {
			skb_queue_head(&session->ctrl_transmit, skb);
			break;
		}

		hidp_set_timer(session);
		kfree_skb(skb);
	}
}

static void hidp_process_ctrl_transmit(struct hidp_session *session)
{
	struct sk_buff *skb;

	BT_DBG("session %p", session);

	while ((skb = skb_dequeue(&session->ctrl_transmit))) {
		if (hidp_send_frame(session->ctrl_sock, skb->data, skb->len) < 0) {
			skb_queue_head(&session->ctrl_transmit, skb);
			break;
		}

		hidp_set_timer(session);
		kfree_skb(skb);
	}
}
