mfd: ls2kbmc: Fix an IS_ERR() vs NULL check in probe()

The devm_kzalloc() function returns NULL on error so check for that
instead of error pointers.

Fixes: d952bba ("mfd: ls2kbmc: Add Loongson-2K BMC reset function support")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Message-ID: <df80c6d61229eb8f877c3694525c0f97e64a43e8.1759478975.git.dan.carpenter@linaro.org>
Signed-off-by: Corey Minyard <corey@minyard.net>

Author: Dan Carpenter

drivers/mfd/ls2k-bmc-core.c

@@ -469,7 +469,7 @@ static int ls2k_bmc_probe(struct pci_dev *dev, const struct pci_device_id *id)
 		return ret;
 
 	ddata = devm_kzalloc(&dev->dev, sizeof(*ddata), GFP_KERNEL);
-	if (IS_ERR(ddata)) {
+	if (!ddata) {
 		ret = -ENOMEM;
 		goto disable_pci;
 	}