Staging: asus_oled: do not initialise statics to 0 or NULL

fix the following error reported by checkpatch.pl
ERROR: do not initialise statics to 0 or NULL
Signed-off-by: NAndre Haupt <andre@bitwigglers.org>
Cc: Jakub Schmidtke <sjakub@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/asus_oled/asus_oled.c

@@ -56,10 +56,10 @@ MODULE_AUTHOR("Jakub Schmidtke, sjakub@gmail.com");
 MODULE_DESCRIPTION("Asus OLED Driver v" ASUS_OLED_VERSION);
 MODULE_LICENSE("GPL");
 
-static struct class *oled_class = NULL;
-static int oled_num = 0;
+static struct class *oled_class;
+static int oled_num;
 
-static uint start_off = 0;
+static uint start_off;
 
 module_param(start_off, uint, 0644);