NVMe: Fix error handling of class_create("nvme")

class_create() returns ERR_PTR on failure,
so IS_ERR() should be used instead of check for NULL.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index ef432786213b..9052553eda65 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -3163,8 +3163,10 @@ static int __init nvme_init(void)
                 nvme_char_major = result;
 
         nvme_class = class_create(THIS_MODULE, "nvme");
-        if (!nvme_class)
+        if (IS_ERR(nvme_class)) {
+                result = PTR_ERR(nvme_class);
                 goto unregister_chrdev;
+        }
 
         result = pci_register_driver(&nvme_driver);
         if (result)