selftests/sched_ext: Fix wrong DSQ ID in peek_dsq error message
The error path after scx_bpf_create_dsq(real_dsq_id, ...) was reporting
test_dsq_id instead of real_dsq_id in the error message, which would
mislead debugging.
Signed-off-by: fangqiurong <fangqiurong@kylinos.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>
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