[patch] drm/layerscape: fix a signedness bug

[Dan Carpenter]

"index" needs to be signed for the error handling to work.  Really "ret"
should be an int as well.

Fixes: 109eee2f2a18 ('drm/layerscape: Add Freescale DCU DRM driver')
Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c 
b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
index 82be6b8..d1e300d 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
@@ -58,7 +58,8 @@ static void fsl_dcu_drm_plane_atomic_disable(struct drm_plane 
*plane,
                                             struct drm_plane_state *old_state)
 {
        struct fsl_dcu_drm_device *fsl_dev = plane->dev->dev_private;
-       unsigned int index, value, ret;
+       unsigned int value;
+       int index, ret;

        index = fsl_dcu_drm_plane_index(plane);
        if (index < 0)