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

Return the error code when command fails.

Fixes: 13324edbe926 ("memory: tegra186-emc: Handle errors in BPMP response")
Signed-off-by: Yang Yingliang <[e-mail]>
Reviewed-by: Mikko Perttunen <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

drivers/memory/tegra/tegra186-emc.c

···
 		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;
 	}