fix compilation with 4.8 TC

net/bluetooth/hci_conn.c:407:28: 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]
error, forbidden warning: hci_conn.c:407
make[4]: *** [net/bluetooth/hci_conn.o] Error 1
make[3]: *** [net/bluetooth] Error 2
make[2]: *** [net] Error 2
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