Bluetooth: hci_core: Eliminate an unnecessary goto label in hci_find_irk_by_addr()

Eliminate an unnecessary goto label by using break instead of goto to
exit the loop in hci_find_irk_by_addr().

Signed-off-by: Zijun Hu <zijun.hu@oss.qualcomm.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>