batman-adv: convert time_after instances to has_timed_out

To increase readability the has_timed_out() functions has been introduced.
This patch converts existing time_after() calls to use this wrapper
function (if applicable).
This patch also converts all timeouts to miliseconds to be consistent.

Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
diff --git a/net/batman-adv/vis.h b/net/batman-adv/vis.h
index 31b820d..851bc4f 100644
--- a/net/batman-adv/vis.h
+++ b/net/batman-adv/vis.h
@@ -22,7 +22,8 @@
 #ifndef _NET_BATMAN_ADV_VIS_H_
 #define _NET_BATMAN_ADV_VIS_H_
 
-#define VIS_TIMEOUT		200	/* timeout of vis packets in seconds */
+#define VIS_TIMEOUT		200000	/* timeout of vis packets
+					 * in miliseconds */
 
 int vis_seq_print_text(struct seq_file *seq, void *offset);
 void receive_server_sync_packet(struct bat_priv *bat_priv,