Freezer: use __set_current_state in refrigerator

Use __set_current_state() as appropriate in refrigerator() instead of
accessing current->state directly.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/power/process.c b/kernel/power/process.c
index e1bcded..9b5301c 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -72,7 +72,7 @@
 		schedule();
 	}
 	pr_debug("%s left refrigerator\n", current->comm);
-	current->state = save;
+	__set_current_state(save);
 }
 
 static void freeze_task(struct task_struct *p)