kern: Remove trailing whitespaces

Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/kern/emu/main.c

@@ -194,7 +194,7 @@ int
 main (int argc, char *argv[])
 {
   struct arguments arguments =
-    { 
+    {
       .dev_map = DEFAULT_DEVICE_MAP,
       .hold = 0,
       .mem_disk = 0,