memory: tegra186-emc: Fix error return code in tegra186_emc_probe()

Return the error code when command fails.

Fixes: 13324edb ("memory: tegra186-emc: Handle errors in BPMP response")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Link: https://lore.kernel.org/r/20210928021545.3774677-1-yangyingliang@huawei.comSigned-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

drivers/memory/tegra/tegra186-emc.c

@@ -198,6 +198,7 @@ static int tegra186_emc_probe(struct platform_device *pdev)
 		goto put_bpmp;
 	}
 	if (msg.rx.ret < 0) {
+		err = -EINVAL;
 		dev_err(&pdev->dev, "EMC DVFS MRQ failed: %d (BPMP error code)\n", msg.rx.ret);
 		goto put_bpmp;
 	}