net/bluetooth/l2cap_core: fix: 'warning: '...' may be used uninitialized in this function'

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
net/bluetooth/hci_conn.c: fix: warning: argument to 'sizeof' in 'memcpy' call is the same pointer type '__u8 *' as the destination

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
GCC 4.7 fixes