sched_ext: Fix stray scx_root usage in task_can_run_on_remote_rq()

task_can_run_on_remote_rq() takes @sch but it is using scx_root when
incrementing SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE, which is inconsistent and
gets in the way of implementing multiple scheduler support. Use @sch
instead. As currently scx_root is the only possible scheduler instance, this
doesn't cause any behavior changes.

Acked-by: Andrea Righi <[e-mail]>
Signed-off-by: Tejun Heo <[e-mail]>

kernel/sched/ext.c

···
 
 	if (!scx_rq_online(rq)) {
 		if (enforce)
-			__scx_add_event(scx_root,
-					SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE, 1);
+			__scx_add_event(sch, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE, 1);
 		return false;
 	}