nvmem: jz4780-efuse: Use PTR_ERR_OR_ZERO() to simplify code

Fixes coccicheck warning:

drivers/nvmem/jz4780-efuse.c:214:1-3: WARNING: PTR_ERR_OR_ZERO can be used

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Samuel Zou <[e-mail]>
Signed-off-by: Srinivas Kandagatla <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/nvmem/jz4780-efuse.c

···
 	cfg.priv = efuse;
 
 	nvmem = devm_nvmem_register(dev, &cfg);
-	if (IS_ERR(nvmem))
-		return PTR_ERR(nvmem);
 
-	return 0;
+	return PTR_ERR_OR_ZERO(nvmem);
 }
 
 static const struct of_device_id jz4780_efuse_match[] = {