[PATCH -next] drm/amdgpu: fix return value check in amdgpu_debugfs_regs_init()

[Wei Yongjun]

From: Wei Yongjun <yongjun_...@trendmicro.com.cn>

In case of error, the function debugfs_create_*() returns NULL
pointer not ERR_PTR() if debugfs is enabled. The IS_ERR() test
in the return value check should be replaced with NULL test.
(defined(CONFIG_DEBUG_FS) make sure debugfs is enabled)

Signed-off-by: Wei Yongjun <yongjun_wei at trendmicro.com.cn>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 614fb02..0c992d3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2530,12 +2530,12 @@ static int amdgpu_debugfs_regs_init(struct 
amdgpu_device *adev)
                ent = debugfs_create_file(debugfs_regs_names[i],
                                          S_IFREG | S_IRUGO, root,
                                          adev, debugfs_regs[i]);
-               if (IS_ERR(ent)) {
+               if (!ent) {
                        for (j = 0; j < i; j++) {
                                debugfs_remove(adev->debugfs_regs[i]);
                                adev->debugfs_regs[i] = NULL;
                        }
-                       return PTR_ERR(ent);
+                       return -ENOMEM;
                }

                if (!i)