mfd: intel-lpss: Use PCI APIs instead of dereferencing

We have a few PCI APIs that may be used instead of direct dereferencing,
Using them will also provide better error codes.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20231106184052.1166579-2-andriy.shevchenko@linux.intel.comSigned-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/intel-lpss-pci.c

@@ -37,13 +37,17 @@ static int intel_lpss_pci_probe(struct pci_dev *pdev,
 	if (ret)
 		return ret;
 
+	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_LEGACY);
+	if (ret)
+		return ret;
+
 	info = devm_kmemdup(&pdev->dev, (void *)id->driver_data, sizeof(*info),
 			    GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
 
-	info->mem = &pdev->resource[0];
-	info->irq = pdev->irq;
+	info->mem = pci_resource_n(pdev, 0);
+	info->irq = pci_irq_vector(pdev, 0);
 
 	if (pci_match_id(ignore_resource_conflicts_ids, pdev))
 		info->ignore_resource_conflicts = true;