rapidio/tsi721: 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.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Cai Huoqing <[e-mail]>
Cc: Alexandre Bounine <[e-mail]>
Cc: Matt Porter <[e-mail]>
Cc: Tetsuo Handa <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

drivers/rapidio/devices/tsi721.c

···
 		iounmap(priv->odb_base);
 err_free_res:
 	pci_release_regions(pdev);
-	pci_clear_master(pdev);
 err_disable_pdev:
 	pci_disable_device(pdev);
 err_clean:
···
 		pci_disable_msi(priv->pdev);
 #endif
 	pci_release_regions(pdev);
-	pci_clear_master(pdev);
 	pci_disable_device(pdev);
 	pci_set_drvdata(pdev, NULL);
 	kfree(priv);
···
 
 	tsi721_disable_ints(priv);
 	tsi721_dma_stop_all(priv);
-	pci_clear_master(pdev);
 	pci_disable_device(pdev);
 }