platform/mellanox: Check devm_hwmon_device_register_with_groups() return value

devm_hwmon_device_register_with_groups() returns an error pointer upon
failure. Check its return value for errors.

Compile-tested only.

Fixes: 1a218d3 ("platform/mellanox: mlxbf-pmc: Add Mellanox BlueField PMC driver")
Suggested-by: Ilpo Järvinen <[email protected]>
Suggested-by: Vadim Pasternak <[email protected]>
Signed-off-by: Kunwu Chan <[email protected]>
Reviewed-by: Vadim Pasternak <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ij: split the change into two]
Reviewed-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Ilpo Järvinen <[email protected]>

Author: KunWuChan

drivers/platform/mellanox/mlxbf-pmc.c

@@ -2075,6 +2075,8 @@ static int mlxbf_pmc_probe(struct platform_device *pdev)
 
 	pmc->hwmon_dev = devm_hwmon_device_register_with_groups(
 		dev, "bfperf", pmc, pmc->groups);
+	if (IS_ERR(pmc->hwmon_dev))
+		return PTR_ERR(pmc->hwmon_dev);
 	platform_set_drvdata(pdev, pmc);
 
 	return 0;