selftests/sched_ext: Fix dsq_move_to_local check

scan_dsq_pool() checked == 0 against scx_bpf_dsq_move_to_local(),
which returns true on success. This inverted success and failure,
causing peek_dsq_dispatch() to double-dispatch on success and skip
the real_dsq fallback on failure.

Signed-off-by: Cheng-Yang Chou <yphbchou0911@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

Author: EricccTaiwan

tools/testing/selftests/sched_ext/peek_dsq.bpf.c

@@ -95,7 +95,7 @@ static int scan_dsq_pool(void)
 			record_peek_result(task->pid);
 
 			/* Try to move this task to local */
-			if (!moved && scx_bpf_dsq_move_to_local(dsq_id, 0) == 0) {
+			if (!moved && scx_bpf_dsq_move_to_local(dsq_id, 0)) {
 				moved = 1;
 				break;
 			}