clk: sunxi-ng: Fix header guard of ccu-sun8i-r.h

Remove trailing extra underscore in definition of _CCU_SUN8I_R_H
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

drivers/clk/sunxi-ng/ccu-sun8i-r.h

@@ -13,7 +13,7 @@
  */
 
 #ifndef _CCU_SUN8I_R_H
-#define _CCU_SUN8I_R_H_
+#define _CCU_SUN8I_R_H
 
 #include <dt-bindings/clock/sun8i-r-ccu.h>
 #include <dt-bindings/reset/sun8i-r-ccu.h>