rtc/m41t80: use rtc_valid_tm() to check returned tm

Use rtc_valid_tm() to check returned struct rtc_time *tm - it can avoid
returning wrong tm value.

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>