drm: Add a missing ')'

The code happened to compile because the flag wasn't actually used yet.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

include/drm/drm_mode.h

@@ -268,7 +268,7 @@ struct drm_mode_fb_cmd {
 	__u32 handle;
 };
 
-#define DRM_MODE_FB_INTERLACED	(1<<0 /* for interlaced framebuffers */
+#define DRM_MODE_FB_INTERLACED	(1<<0) /* for interlaced framebuffers */
 
 struct drm_mode_fb_cmd2 {
 	__u32 fb_id;