drm/i915/gt: Add a space before '('

Checkpatch noticed a while(0) and complains about the lack of space.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210122192913.4518-9-chris@chris-wilson.co.ukSigned-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/gt/intel_renderstate.c

@@ -43,7 +43,7 @@ render_state_get_rodata(const struct intel_engine_cs *engine)
 		if ((i) >= PAGE_SIZE / sizeof(u32))		\
 			goto out;				\
 		(batch)[(i)++] = (val);				\
-	} while(0)
+	} while (0)
 
 static int render_state_setup(struct intel_renderstate *so,
 			      struct drm_i915_private *i915)