net/bluetooth/hci_conn.c: Fix compile with GCC 4.8

../../../../../../kernel/motorola/msm8960-common/net/bluetooth/hci_conn.c: In function 'hci_le_ltk_reply':
../../../../../../kernel/motorola/msm8960-common/net/bluetooth/hci_conn.c:431:28: warning: argument to 'sizeof' in 'memcpy' call is the same pointer type '__u8 *' as the destination; expected '__u8' or an explicit length [-Wsizeof-pointer-memaccess]