parport: parport_serial: Use dev_get_drvdata

Instead of using to_pci_dev + pci_get_drvdata,
use dev_get_drvdata to make code simpler.
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Link: https://lore.kernel.org/r/20190801191408.10977-3-sudipm.mukherjee@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/parport/parport_serial.c

@@ -660,8 +660,7 @@ static void parport_serial_pci_remove(struct pci_dev *dev)
 
 static int __maybe_unused parport_serial_pci_suspend(struct device *dev)
 {
-	struct pci_dev *pdev = to_pci_dev(dev);
-	struct parport_serial_private *priv = pci_get_drvdata(pdev);
+	struct parport_serial_private *priv = dev_get_drvdata(dev);
 
 	if (priv->serial)
 		pciserial_suspend_ports(priv->serial);
@@ -672,8 +671,7 @@ static int __maybe_unused parport_serial_pci_suspend(struct device *dev)
 
 static int __maybe_unused parport_serial_pci_resume(struct device *dev)
 {
-	struct pci_dev *pdev = to_pci_dev(dev);
-	struct parport_serial_private *priv = pci_get_drvdata(pdev);
+	struct parport_serial_private *priv = dev_get_drvdata(dev);
 
 	if (priv->serial)
 		pciserial_resume_ports(priv->serial);