rtc: pcf8523: don't return invalid date when battery is low
commit ecb4a353d3afd45b9bb30c85d03ee113a0589079 upstream. The RTC_VL_READ ioctl reports the low battery condition. Still, pcf8523_rtc_read_time() happily returns invalid dates in this case. Check the battery health on pcf8523_rtc_read_time() to avoid that. Reported-by: NErik Čuk <erik.cuk@domel.com> Signed-off-by: NBaruch Siach <baruch@tkos.co.il> Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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