blk-cgroup: Return -ENOMEM directly in blkcg_css_alloc() error path

For blkcg_css_alloc(), the only error that will be returned is -ENOMEM.
Simplify error handling code by returning this error directly instead
of setting an intermediate "ret" variable.

Signed-off-by: Waiman Long <longman@redhat.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20221105005902.407297-2-longman@redhat.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>