PM / Freezer: fix return value of freezable_schedule_timeout_killable()

...it should return the return code from schedule_timeout_killable(),
not the one from freezer_count().

All of the current callers ignore the return code so the bug is
harmless but it's worth fixing.
Signed-off-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>

include/linux/freezer.h

@@ -116,9 +116,11 @@ static inline int freezer_should_skip(struct task_struct *p)
 /* Like schedule_timeout_killable(), but should not block the freezer. */
 #define freezable_schedule_timeout_killable(timeout)			\
 ({									\
+	long __retval;							\
 	freezer_do_not_count();						\
-	schedule_timeout_killable(timeout);				\
+	__retval = schedule_timeout_killable(timeout);			\
 	freezer_count();						\
+	__retval;							\
 })
 
 /*