batman-adv: Prefix gateway-common 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/bat_sysfs.c b/net/batman-adv/bat_sysfs.c
index 31d23db..a8fb660 100644
--- a/net/batman-adv/bat_sysfs.c
+++ b/net/batman-adv/bat_sysfs.c
@@ -409,7 +409,7 @@
 	int down, up;
 	int gw_bandwidth = atomic_read(&bat_priv->gw_bandwidth);
 
-	gw_bandwidth_to_kbit(gw_bandwidth, &down, &up);
+	batadv_gw_bandwidth_to_kbit(gw_bandwidth, &down, &up);
 	return sprintf(buff, "%i%s/%i%s\n",
 		       (down > 2048 ? down / 1024 : down),
 		       (down > 2048 ? "MBit" : "KBit"),
@@ -425,7 +425,7 @@
 	if (buff[count - 1] == '\n')
 		buff[count - 1] = '\0';
 
-	return gw_bandwidth_set(net_dev, buff, count);
+	return batadv_gw_bandwidth_set(net_dev, buff, count);
 }
 
 BAT_ATTR_SIF_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);