[patch] drm: ARM HDLCD - fix an error code

[Dan Carpenter]

We accidentally return PTR_ERR(NULL) which is success instead of a
negative error code.

Fixes: 879e40bea6f2 ('drm: ARM HDLCD - get rid of devm_clk_put()')
Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
index 734849f..3ac1ae4 100644
--- a/drivers/gpu/drm/arm/hdlcd_drv.c
+++ b/drivers/gpu/drm/arm/hdlcd_drv.c
@@ -55,8 +55,9 @@ static int hdlcd_load(struct drm_device *drm, unsigned long 
flags)
        hdlcd->mmio = devm_ioremap_resource(drm->dev, res);
        if (IS_ERR(hdlcd->mmio)) {
                DRM_ERROR("failed to map control registers area\n");
+               ret = PTR_ERR(hdlcd->mmio);
                hdlcd->mmio = NULL;
-               return PTR_ERR(hdlcd->mmio);
+               return ret;
        }

        version = hdlcd_read(hdlcd, HDLCD_REG_VERSION);