linux-wandboard

MLK-12295 Bluetooth: add hdev check to avoid passing null pointer

Function hci_mgmt_cmd() may pass hdev with null pointer to hci_mgmt_handler->func()
like below code:
	err = handler->func(sk, hdev, cp, len);

Add hdev check to avoid passing null pointer.

Signed-off-by: Fugang Duan <B38611@freescale.com>