drm/rcar-du: Use dynamic number of CRTCs instead of CRTCs array size

The rcar_du_device structure contains a field that stores the number of
CRTCs, use it instead of the CRTCs array size. This prepares the driver
to support a variable number of CRTCs.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

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

@@ -105,7 +105,7 @@ static void rcar_du_preclose(struct drm_device *dev, struct drm_file *file)
 	struct rcar_du_device *rcdu = dev->dev_private;
 	unsigned int i;
 
-	for (i = 0; i < ARRAY_SIZE(rcdu->crtcs); ++i)
+	for (i = 0; i < rcdu->num_crtcs; ++i)
 		rcar_du_crtc_cancel_page_flip(&rcdu->crtcs[i], file);
 }
 

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

@@ -197,7 +197,7 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 		if (pdata->type == RCAR_DU_ENCODER_UNUSED)
 			continue;
 
-		if (pdata->output >= ARRAY_SIZE(rcdu->crtcs)) {
+		if (pdata->output >= rcdu->num_crtcs) {
 			dev_warn(rcdu->dev,
 				 "encoder %u references unexisting output %u, skipping\n",
 				 i, pdata->output);