rtc: rzn1: Check return value in rzn1_rtc_probe

The rzn1_rtc_probe() function utilizes devm_pm_runtime_enable()
but wasn't checking the return value. Fix it by adding missing
check.

Fixes: deeb4b53 ("rtc: rzn1: Add new RTC driver")

Signed-off-by: Yushan Zhou <katrinzhou@tencent.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20221107092544.3721053-1-zys.zljxml@gmail.com


Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>