sched_ext: use correct function name in pick_task_scx() warning message

pick_next_task_scx() was turned into pick_task_scx() since
commit 753e2836 ("sched_ext: Unify regular and core-sched pick
task paths"). Update the outdated message.
Signed-off-by: Honglei Wang <jameshongleiwang@126.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/sched/ext.c

@@ -2958,8 +2958,8 @@ static struct task_struct *pick_task_scx(struct rq *rq)
 
 		if (unlikely(!p->scx.slice)) {
 			if (!scx_rq_bypassing(rq) && !scx_warned_zero_slice) {
-				printk_deferred(KERN_WARNING "sched_ext: %s[%d] has zero slice in pick_next_task_scx()\n",
-						p->comm, p->pid);
+				printk_deferred(KERN_WARNING "sched_ext: %s[%d] has zero slice in %s()\n",
+						p->comm, p->pid, __func__);
 				scx_warned_zero_slice = true;
 			}
 			p->scx.slice = SCX_SLICE_DFL;