[PATCH -next] ndtest: Fix incorrect handling for return value of device_create_with_groups.

[Lin Yujun]

The return value of device_create_with_groups will not
be an null pointer, use IS_ERR() to fix incorrect handling
return value of device_create_with_groups.

Fixes: 9399ab61ad82 ("ndtest: Add dimms to the two buses")
Signed-off-by: Lin Yujun <linyujun...@h-partners.com>
---
 tools/testing/nvdimm/test/ndtest.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/nvdimm/test/ndtest.c 
b/tools/testing/nvdimm/test/ndtest.c
index 68a064ce598c..7d722f2f7d62 100644
--- a/tools/testing/nvdimm/test/ndtest.c
+++ b/tools/testing/nvdimm/test/ndtest.c
@@ -745,11 +745,11 @@ static int ndtest_dimm_register(struct ndtest_priv *priv,
 
        dimm->dev = device_create_with_groups(&ndtest_dimm_class,
                                             &priv->pdev.dev,
                                             0, dimm, dimm_attribute_groups,
                                             "test_dimm%d", id);
-       if (!dimm->dev) {
+       if (IS_ERR(dimm->dev)) {
                pr_err("Could not create dimm device attributes\n");
                return -ENOMEM;
        }
 
        return 0;
-- 
2.34.1