batman: fix duplicate #include of multicast.h

The header multicast.h was included twice, so delete one of them.
Signed-off-by: Jean Sacren <sakiwit@gmail.com>
Cc: Marek Lindner <mareklindner@neomailbox.ch>
Cc: Simon Wunderlich <sw@simonwunderlich.de>
Cc: Antonio Quartulli <antonio@meshcoding.com>
Cc: b.a.t.m.a.n@lists.open-mesh.org
Signed-off-by: David S. Miller <davem@davemloft.net>

net/batman-adv/multicast.c

@@ -20,7 +20,6 @@
 #include "originator.h"
 #include "hard-interface.h"
 #include "translation-table.h"
-#include "multicast.h"
 
 /**
  * batadv_mcast_mla_softif_get - get softif multicast listeners