sched: remove WARN_ON on checking rq->tmp_alone_branch

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I9VPMT



---------------------------

Remove warn printk for checking 'rq->tmp_alone_branch !=
&rq->leaf_cfs_rq_list' to avoid rq deadlock.

Deadlock analaze:
cpu 0

distribute_cfs_runtime  --- rq_lock_irqsave(rq, &rf);
->__warn_printk
  ->try_to_wake_up      --- rq_lock(rq, &rf), deadlock

Call Trace:
  queued_spin_lock_slowpath at ffff000080173358
  try_to_wake_up at ffff000080141068
  wake_up_process at ffff00008014113c
  insert_work at ffff000080123750
  __queue_work at ffff0000801257ac
  queue_work_on at ffff000080125c54
  drm_fb_helper_dirty at ffff0000806dcd44
  drm_fb_helper_sys_imageblit at ffff0000806dcf04
  virtio_gpu_3d_imageblit at ffff000000c915d0 [virtio_gpu]
  soft_cursor at ffff0000805e3e04
  bit_cursor at ffff0000805e3654
  fbcon_cursor at ffff0000805df404
  hide_cursor at ffff000080677d68
  vt_console_print at ffff0000806799dc
  console_unlock at ffff000080183d78
  vprintk_emit at ffff000080185948
  vprintk_default at ffff000080185b80
  vprintk_func at ffff000080186c44
  printk at ffff000080186394
  __warn_printk at ffff000080102d60
  unthrottle_cfs_rq at ffff000080155e50
  distribute_cfs_runtime at ffff00008015617c
  sched_cfs_period_timer at ffff00008015654c
  __hrtimer_run_queues at ffff0000801b2c58
  hrtimer_interrupt at ffff0000801b3c74
  arch_timer_handler_virt at ffff00008089dc3c
  handle_percpu_devid_irq at ffff00008018fb3c
  generic_handle_irq at ffff000080187140
  __handle_domain_irq at ffff000080187adc
  gic_handle_irq at ffff000080081814

Fixes: 6e9efc5d ("sched/fair: Add tmp_alone_branch assertion")
Signed-off-by: Hui Tang <tanghui20@huawei.com>