batman-adv: get rid of pointless cast in memcpy()

memcpy() arguments are void *, precisely to avoid that kind of pointless
casts.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sven Eckelmann <sven@narfation.org>

diff --cc net/batman-adv/bridge_loop_avoidance.c
Simple merge