batman-adv: iv_ogm, fix comment function name

This is a small copy paste fix for batadv_ing_buffer_avg.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c
index 0019f1b..9f83137 100644
--- a/net/batman-adv/bat_iv_ogm.c
+++ b/net/batman-adv/bat_iv_ogm.c
@@ -55,7 +55,7 @@
 }
 
 /**
- * batadv_ring_buffer_set - compute the average of all non-zero values stored
+ * batadv_ring_buffer_avg - compute the average of all non-zero values stored
  * in the given ring buffer
  * @lq_recv: pointer to the ring buffer
  *