batman-adv: use seq_puts instead of seq_printf when the format is constant

As reported by checkpatch, seq_puts has to be preferred with
respect to seq_printf when the format is a constant string
(no va_args)

Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
diff --git a/net/batman-adv/vis.c b/net/batman-adv/vis.c
index c053244..962ccf3 100644
--- a/net/batman-adv/vis.c
+++ b/net/batman-adv/vis.c
@@ -149,7 +149,7 @@
 
 	hlist_for_each_entry(entry, if_list, list) {
 		if (entry->primary)
-			seq_printf(seq, "PRIMARY, ");
+			seq_puts(seq, "PRIMARY, ");
 		else
 			seq_printf(seq,  "SEC %pM, ", entry->addr);
 	}
@@ -207,7 +207,7 @@
 		if (batadv_compare_eth(entry->addr, packet->vis_orig))
 			batadv_vis_data_read_prim_sec(seq, list);
 
-		seq_printf(seq, "\n");
+		seq_puts(seq, "\n");
 	}
 }