[PATCH 1/3] drm/xen-front: checking for NULL instead of IS_ERR

[Dan Carpenter]

drm_dev_alloc() returns error pointers, it never returns NULL.

Fixes: c575b7eeb89f ("drm/xen-front: Add support for Xen PV display frontend")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/gpu/drm/xen/xen_drm_front.c 
b/drivers/gpu/drm/xen/xen_drm_front.c
index 1b0ea9ac330e..8615e8522c7a 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.c
+++ b/drivers/gpu/drm/xen/xen_drm_front.c
@@ -543,8 +543,8 @@ static int xen_drm_drv_init(struct xen_drm_front_info 
*front_info)
        front_info->drm_info = drm_info;
 
        drm_dev = drm_dev_alloc(&xen_drm_driver, dev);
-       if (!drm_dev) {
-               ret = -ENOMEM;
+       if (IS_ERR(drm_dev)) {
+               ret = PTR_ERR(drm_dev);
                goto fail;
        }
 
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