isdn: mISDN: netjet: Remove redundant pci_clear_master

Remove pci_clear_master to simplify the code,
the bus-mastering is also cleared in do_pci_disable_device,
like this:
./drivers/pci/pci.c:2197
static void do_pci_disable_device(struct pci_dev *dev)
{
	u16 pci_command;

	pci_read_config_word(dev, PCI_COMMAND, &pci_command);
	if (pci_command & PCI_COMMAND_MASTER) {
		pci_command &= ~PCI_COMMAND_MASTER;
		pci_write_config_word(dev, PCI_COMMAND, pci_command);
	}

	pcibios_disable_device(dev);
}.
And dev->is_busmaster is set to 0 in pci_disable_device.
Signed-off-by: Cai Huoqing <cai.huoqing@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/isdn/hardware/mISDN/netjet.c

@@ -970,7 +970,6 @@ nj_release(struct tiger_hw *card)
 	write_lock_irqsave(&card_lock, flags);
 	list_del(&card->list);
 	write_unlock_irqrestore(&card_lock, flags);
-	pci_clear_master(card->pdev);
 	pci_disable_device(card->pdev);
 	pci_set_drvdata(card->pdev, NULL);
 	kfree(card);