PM: sleep: No need to check PF_WQ_WORKER in thaw_kernel_threads()

Because PF_KTHREAD is set for all wq worker threads, it is
not necessary to check PF_WQ_WORKER in addition to it in
thaw_kernel_threads(), so stop doing that.
Signed-off-by: Zqiang <qiang.zhang@windriver.com>
[ rjw: Subject and changelog rewrite ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

kernel/power/process.c

@@ -235,7 +235,7 @@ void thaw_kernel_threads(void)
 
 	read_lock(&tasklist_lock);
 	for_each_process_thread(g, p) {
-		if (p->flags & (PF_KTHREAD | PF_WQ_WORKER))
+		if (p->flags & PF_KTHREAD)
 			__thaw_task(p);
 	}
 	read_unlock(&tasklist_lock);