usb: Use dev_is_pci() to check whether it is pci device

Use PCI standard marco dev_is_pci() instead of directly compare
pci_bus_type to check whether it is pci device.
Signed-off-by: NYijing Wang <wangyijing@huawei.com>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ehci-dbg.c

@@ -818,7 +818,7 @@ static ssize_t fill_registers_buffer(struct debug_buffer *buf)
 
 #ifdef	CONFIG_PCI
 	/* EHCI 0.96 and later may have "extended capabilities" */
-	if (hcd->self.controller->bus == &pci_bus_type) {
+	if (dev_is_pci(hcd->self.controller)) {
 		struct pci_dev	*pdev;
 		u32		offset, cap, cap2;
 		unsigned	count = 256/4;