i2c: designware-pci: Use standard pattern for memory allocation

The pattern
	foo = kmalloc(sizeof(*foo), GFP_KERNEL);
has an advantage when foo type is changed. Since we are planning a such,
better to be prepared by using standard pattern for memory allocation.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-designware-pcidrv.c

@@ -263,7 +263,7 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
 		return dev_err_probe(&pdev->dev, r,
 				     "I/O memory remapping failed\n");
 
-	dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return -ENOMEM;