Staging: batman-adv: Remove useless braces

77099f0a added changes to vis.c which
trigger a checkpatch.pl warning about braces which are not necessary
anymore.

WARNING: braces {} are not necessary for any arm of this statement
+               if (entry->primary)
[...]
+               else {
[...]

Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Marek Lindner <lindner_marek@yahoo.de>
Cc: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Cc: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>