Revert "timekeeping: Fix ktime_add overflow in tk_set_wall_to_mono"

hulk inclusion
category: bugfix
bugzilla: 185900, https://gitee.com/openeuler/kernel/issues/I4MOGB
CVE: NA

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This reverts commit 56ef5ae6.
Commit 7a8e61f8 force upper bound for setting CLOCK_REALTIME.
The realtime is limited, so just revert it.
Signed-off-by: NYu Liao <liaoyu15@huawei.com>
Reviewed-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

kernel/time/timekeeping.c

@@ -144,8 +144,7 @@ static void tk_set_wall_to_mono(struct timekeeper *tk, struct timespec64 wtm)
 	tk->wall_to_monotonic = wtm;
 	set_normalized_timespec64(&tmp, -wtm.tv_sec, -wtm.tv_nsec);
 	tk->offs_real = timespec64_to_ktime(tmp);
-	tk->offs_tai = ktime_add_safe(tk->offs_real,
-				      ktime_set(tk->tai_offset, 0));
+	tk->offs_tai = ktime_add(tk->offs_real, ktime_set(tk->tai_offset, 0));
 }
 
 static inline void tk_update_sleep_time(struct timekeeper *tk, ktime_t delta)