gpio: pch: Cache &pdev->dev to reduce repetition

pch_gpio_probe() repeats the "&pdev->dev" expression several times.  Cache
the result as "struct device *dev" to reduce the repetition.  No functional
change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/gpio/gpio-pch.c

@@ -346,24 +346,25 @@ static int pch_gpio_alloc_generic_chip(struct pch_gpio *chip,
 static int pch_gpio_probe(struct pci_dev *pdev,
 				    const struct pci_device_id *id)
 {
+	struct device *dev = &pdev->dev;
 	s32 ret;
 	struct pch_gpio *chip;
 	int irq_base;
 
-	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
+	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
 	if (chip == NULL)
 		return -ENOMEM;
 
-	chip->dev = &pdev->dev;
+	chip->dev = dev;
 	ret = pcim_enable_device(pdev);
 	if (ret) {
-		dev_err(&pdev->dev, "pci_enable_device FAILED");
+		dev_err(dev, "pci_enable_device FAILED");
 		return ret;
 	}
 
 	ret = pcim_iomap_regions(pdev, BIT(1), KBUILD_MODNAME);
 	if (ret) {
-		dev_err(&pdev->dev, "pci_request_regions FAILED-%d", ret);
+		dev_err(dev, "pci_request_regions FAILED-%d", ret);
 		return ret;
 	}
 
@@ -374,16 +375,16 @@ static int pch_gpio_probe(struct pci_dev *pdev,
 	spin_lock_init(&chip->spinlock);
 	pch_gpio_setup(chip);
 
-	ret = devm_gpiochip_add_data(&pdev->dev, &chip->gpio, chip);
+	ret = devm_gpiochip_add_data(dev, &chip->gpio, chip);
 	if (ret) {
-		dev_err(&pdev->dev, "PCH gpio: Failed to register GPIO\n");
+		dev_err(dev, "PCH gpio: Failed to register GPIO\n");
 		return ret;
 	}
 
-	irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0,
+	irq_base = devm_irq_alloc_descs(dev, -1, 0,
 					gpio_pins[chip->ioh], NUMA_NO_NODE);
 	if (irq_base < 0) {
-		dev_warn(&pdev->dev, "PCH gpio: Failed to get IRQ base num\n");
+		dev_warn(dev, "PCH gpio: Failed to get IRQ base num\n");
 		chip->irq_base = -1;
 		return 0;
 	}
@@ -393,10 +394,10 @@ static int pch_gpio_probe(struct pci_dev *pdev,
 	iowrite32(BIT(gpio_pins[chip->ioh]) - 1, &chip->reg->imask);
 	iowrite32(BIT(gpio_pins[chip->ioh]) - 1, &chip->reg->ien);
 
-	ret = devm_request_irq(&pdev->dev, pdev->irq, pch_gpio_handler,
+	ret = devm_request_irq(dev, pdev->irq, pch_gpio_handler,
 			       IRQF_SHARED, KBUILD_MODNAME, chip);
 	if (ret) {
-		dev_err(&pdev->dev, "request_irq failed\n");
+		dev_err(dev, "request_irq failed\n");
 		return ret;
 	}