batman-adv: Prefix unicast non-static functions with batadv_

batman-adv can be compiled as part of the kernel instead of an module. In that
case the linker will see all non-static symbols of batman-adv and all other
non-static symbols of the kernel. This could lead to symbol collisions. A
prefix for the batman-adv symbols that defines their private namespace avoids
such a problem.

Reported-by: David Miller <davem@davemloft.net>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index a4b5e64..9fd19257 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -237,7 +237,7 @@
 				goto dropped;
 		}
 
-		ret = unicast_send_skb(skb, bat_priv);
+		ret = batadv_unicast_send_skb(skb, bat_priv);
 		if (ret != 0)
 			goto dropped_freed;
 	}