batman-adv: Calculate sizeof using variable insead of types

Documentation/CodingStyle recommends to use the form

	p = kmalloc(sizeof(*p), ...);

to calculate the size of a struct and not the version where the struct
name is spelled out to prevent bugs when the type of p changes. This
also seems appropriate for manipulation of buffers when they are
directly associated with p.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
diff --git a/net/batman-adv/aggregation.c b/net/batman-adv/aggregation.c
index f8ccb49..b41f25b 100644
--- a/net/batman-adv/aggregation.c
+++ b/net/batman-adv/aggregation.c
@@ -119,7 +119,7 @@
 		}
 	}
 
-	forw_packet_aggr = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC);
+	forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 	if (!forw_packet_aggr) {
 		if (!own_packet)
 			atomic_inc(&bat_priv->batman_queue_left);