FAILED: patch "[PATCH] drm/atmel-hlcdc: check stride values in the first plane" failed to apply to 4.9-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 9fcf2b3c1c0276650fea537c71b513d27d929b05 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Sun, 17 Jun 2018 10:48:22 +0200
Subject: [PATCH] drm/atmel-hlcdc: check stride values in the first plane

The statement always evaluates to true since the struct fields
are arrays. This has shown up as a warning when compiling with
clang:
  warning: address of array 'desc->layout.xstride' will always
      evaluate to 'true' [-Wpointer-bool-conversion]

Check for values in the first plane instead.

Fixes: 1a396789f65a ("drm: add Atmel HLCDC Display Controller support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180617084826.31885-1-stefan@agner.ch

diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
index e18800ed7cd1..7b8191eae68a 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
@@ -875,7 +875,7 @@ static int atmel_hlcdc_plane_init_properties(struct atmel_hlcdc_plane *plane,
 		drm_object_attach_property(&plane->base.base,
 					   props->alpha, 255);
 
-	if (desc->layout.xstride && desc->layout.pstride) {
+	if (desc->layout.xstride[0] && desc->layout.pstride[0]) {
 		int ret;
 
 		ret = drm_plane_create_rotation_property(&plane->base,