usb: host: ehci-sys: delete useless bus_to_hcd conversion

The ehci platform device's drvdata is the pointer of struct usb_hcd
already, so we doesn't need to call bus_to_hcd conversion again.

Cc: <[e-mail]>
Signed-off-by: Peter Chen <[e-mail]>
Acked-by: Alan Stern <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/host/ehci-sysfs.c

···
 	int			count = PAGE_SIZE;
 	char			*ptr = buf;
 
-	ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+	ehci = hcd_to_ehci(dev_get_drvdata(dev));
 	nports = HCS_N_PORTS(ehci->hcs_params);
 
 	for (index = 0; index < nports; ++index) {
···
 	struct ehci_hcd		*ehci;
 	int			portnum, new_owner;
 
-	ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+	ehci = hcd_to_ehci(dev_get_drvdata(dev));
 	new_owner = PORT_OWNER;		/* Owned by companion */
 	if (sscanf(buf, "%d", &portnum) != 1)
 		return -EINVAL;
···
 	struct ehci_hcd		*ehci;
 	int			n;
 
-	ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+	ehci = hcd_to_ehci(dev_get_drvdata(dev));
 	n = scnprintf(buf, PAGE_SIZE, "%d\n", ehci->uframe_periodic_max);
 	return n;
 }
···
 	unsigned long		flags;
 	ssize_t			ret;
 
-	ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
+	ehci = hcd_to_ehci(dev_get_drvdata(dev));
 	if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
 		return -EINVAL;