drm/i915/fixed: simplify FP_16_16_MAX definition

No need to use a compound statement enclosed in parenthesis where a C99
compound literal will do. No functional changes.
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181116120729.7580-3-jani.nikula@intel.com

drivers/gpu/drm/i915/i915_fixed.h

@@ -10,11 +10,7 @@ typedef struct {
 	u32 val;
 } uint_fixed_16_16_t;
 
-#define FP_16_16_MAX ({ \
-	uint_fixed_16_16_t fp; \
-	fp.val = UINT_MAX; \
-	fp; \
-})
+#define FP_16_16_MAX ((uint_fixed_16_16_t){ .val = UINT_MAX })
 
 static inline bool is_fixed16_zero(uint_fixed_16_16_t val)
 {