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: NAlexey Khoroshilov <khoroshilov@ispras.ru> Acked-by: NKeith Busch <keith.busch@intel.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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