net: cxgb4vf: 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/net/ethernet/chelsio/cxgb4vf/cxgb4vf_main.c

@@ -3258,7 +3258,6 @@ static int cxgb4vf_pci_probe(struct pci_dev *pdev,
 
 err_release_regions:
 	pci_release_regions(pdev);
-	pci_clear_master(pdev);
 
 err_disable_device:
 	pci_disable_device(pdev);
@@ -3338,7 +3337,6 @@ static void cxgb4vf_pci_remove(struct pci_dev *pdev)
 	 * Disable the device and release its PCI resources.
 	 */
 	pci_disable_device(pdev);
-	pci_clear_master(pdev);
 	pci_release_regions(pdev);
 }