[patch] drm/amdgpu: potential NULL dereference on error

[Dan Carpenter]

debugfs_create_file() can return an error pointer if debugfs is disabled
or it can return NULL on error.

Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 36be03c..adba2a1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1980,6 +1980,8 @@ static int amdgpu_debugfs_regs_init(struct amdgpu_device *adev)
 				  adev, &amdgpu_debugfs_regs_fops);
 	if (IS_ERR(ent))
 		return PTR_ERR(ent);
+	if (!ent)
+		return -ENOMEM;
 	i_size_write(ent->d_inode, adev->rmmio_size);
 	adev->debugfs_regs = ent;