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/hard-interface.c b/net/batman-adv/hard-interface.c
index e626e75..e0052cf 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -459,7 +459,7 @@
 
 	dev_hold(net_dev);
 
-	hard_iface = kmalloc(sizeof(struct hard_iface), GFP_ATOMIC);
+	hard_iface = kmalloc(sizeof(*hard_iface), GFP_ATOMIC);
 	if (!hard_iface) {
 		pr_err("Can't add interface (%s): out of memory\n",
 		       net_dev->name);