[PATCH] drm/amd/display: fix ptr_ret.cocci warnings

[kbuild test robot]

From: kbuild test robot <fengguang.wu at intel.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c:771:1-3: WARNING: PTR_ERR_OR_ZERO can be used


 Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR

Generated by: scripts/coccinelle/api/ptr_ret.cocci

Fixes: e498eb713604 ("drm/amd/display: Add support for hw_state logging via debugfs")
CC: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Signed-off-by: kbuild test robot <fengguang.wu at intel.com>
---

tree:   git://people.freedesktop.org/~agd5f/linux.git drm-next-4.20-wip
head:   d8de8260a45aae8f74af77eae9a162bdc0ed48d2
commit: e498eb7136042aa9a352b1039c678537f4694158 [220/310] drm/amd/display: Add support for hw_state logging via debugfs

 amdgpu_dm_debugfs.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -768,8 +768,5 @@ int dtn_debugfs_init(struct amdgpu_devic
 		adev,
 		&dtn_log_fops);
 
-	if (IS_ERR(ent))
-		return PTR_ERR(ent);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(ent);
 }