drivers/rtc/interface.c: check the error after __rtc_read_time()
In __rtc_set_alarm(), the error after __rtc_read_time() is not checked. If rtc device fail to read time, we cannot guarantee the following process. Add the verification code for returned __rtc_read_time() error. Signed-off-by: NHyogi Gim <hyogi.gim@lge.com> Acked-by: NAlessandro Zummo <a.zummo@towertech.it> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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