drm/kmb: fix potential memleak in error branch

This patch try to fix coccicheck warning:
./drivers/gpu/drm/kmb/kmb_drv.c:519:2-8: ERROR: missing put_device; call of_find_device_by_node on line 506, but without a corresponding object release within this function.
./drivers/gpu/drm/kmb/kmb_drv.c:522:2-8: ERROR: missing put_device; call of_find_device_by_node on line 506, but without a corresponding object release within this function.
./drivers/gpu/drm/kmb/kmb_drv.c:529:2-8: ERROR: missing put_device; call of_find_device_by_node on line 506, but without a corresponding object release within this function.
./drivers/gpu/drm/kmb/kmb_drv.c:579:1-7: ERROR: missing put_device; call of_find_device_by_node on line 506, but without a corresponding object release within this function.

Signed-off-by: Bernard Zhao <bernard@vivo.com>

drivers/gpu/drm/kmb/kmb_drv.c

@@ -514,17 +514,21 @@ static int kmb_probe(struct platform_device *pdev)
 	ret = kmb_dsi_host_bridge_init(get_device(&dsi_pdev->dev));
 
 	if (ret == -EPROBE_DEFER) {
+		of_dev_put(dsi_pdev);
 		return -EPROBE_DEFER;
 	} else if (ret) {
+		of_dev_put(dsi_pdev);
 		DRM_ERROR("probe failed to initialize DSI host bridge\n");
 		return ret;
 	}
 
 	/* Create DRM device */
 	kmb = devm_drm_dev_alloc(dev, &kmb_driver,
 				 struct kmb_drm_private, drm);
-	if (IS_ERR(kmb))
+	if (IS_ERR(kmb)) {
+		of_dev_put(dsi_pdev);
 		return PTR_ERR(kmb);
+	}
 
 	dev_set_drvdata(dev, &kmb->drm);
 
@@ -572,6 +576,8 @@ static int kmb_probe(struct platform_device *pdev)
 	dev_set_drvdata(dev, NULL);
 	kmb_dsi_host_unregister(kmb->kmb_dsi);
 
+	of_dev_put(dsi_pdev);
+
 	return ret;
 }