drm: rcar-du: Fix typo in comment

Fix the misspelled 'belance' in a comment.

Reported-by: Ulrich Hecht <uli+renesas@fpond.eu>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

drivers/gpu/drm/rcar-du/rcar_du_crtc.c

@@ -701,7 +701,7 @@ static void rcar_du_crtc_atomic_begin(struct drm_crtc *crtc,
 	 * CRTC will be put later in .atomic_disable().
 	 *
 	 * If a mode set is not in progress the CRTC is enabled, and the
-	 * following get call will be a no-op. There is thus no need to belance
+	 * following get call will be a no-op. There is thus no need to balance
 	 * it in .atomic_flush() either.
 	 */
 	rcar_du_crtc_get(rcrtc);