nvmem: sunxi_sid: return -ENOMEM if kzalloc() fails

The driver currently returns -EINVAL if kzalloc() fails in probe().
Change it to -ENOMEM as it should be.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/sunxi_sid.c

@@ -187,7 +187,7 @@ static int sunxi_sid_probe(struct platform_device *pdev)
 
 	randomness = kzalloc(size, GFP_KERNEL);
 	if (!randomness) {
-		ret = -EINVAL;
+		ret = -ENOMEM;
 		goto err_unreg_nvmem;
 	}