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

drivers/rtc/rtc-meson.c

@@ -373,13 +373,10 @@ static int meson_rtc_probe(struct platform_device *pdev)
 
 	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);
 	return ret;