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In normal situations where the driver doesn't dereference "nsim_node->ddir" or "nsim_node->rate_parent" itself then we are not supposed to check the return from debugfs functions. In the case of debugfs_create_dir() the check was wrong as well because it doesn't return NULL, it returns error pointers. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>