rtc: meson: remove useless rtc_nvmem_unregister call

rtc_nvmem_unregister() is called on rtc_device release so it is not
necessary to call it from the driver.

Reviewed-by: Martin Blumenstingl <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>

drivers/rtc/rtc-meson.c

···
 
 	ret = rtc_register_device(rtc->rtc);
 	if (ret)
-		goto out_unregister_nvmem;
+		goto out_disable_vdd;
 
 	return 0;
-
-out_unregister_nvmem:
-	rtc_nvmem_unregister(rtc->rtc);
 
 out_disable_vdd:
 	regulator_disable(rtc->vdd);