sched/__wake_up_sync_key(): Fix nr_exclusive tasks which lead to WF_SYNC clearing
sched/__wake_up_sync_key(): Fix nr_exclusive tasks which lead to WF_SYNC clearing

Only one task can replace the waker.

Signed-off-by: Kirill Tkhai <f0a29e10abf52e3965939db20f961ffd5c7f3d14@yandex.ru>
CC: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>
Signed-off-by: Peter Zijlstra <3fddac958924aef220f202ca567388ddab3f14a8@infradead.org>
Link: 63073e2b3ab84da196248952a64b890a472c8ef9@web25f.yandex.ru
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs