usbip: Correct maximum value of CONFIG_USBIP_VHCI_HC_PORTS

Now that usbip supports USB3, the maximum number of ports allowed
on a hub is 15 (USB_SS_MAXPORTS), not 31 (USB_MAXCHILDREN).

Reported-by: Gianluigi Tiesi <[e-mail]>
Reported-by: Borissh1983 <[e-mail]>
References: https://bugs.debian.org/878866
Fixes: 1c9de5bf4286 ("usbip: vhci-hcd: Add USB3 SuperSpeed support")
Signed-off-by: Ben Hutchings <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/usbip/Kconfig

···
 
 config USBIP_VHCI_HC_PORTS
 	int "Number of ports per USB/IP virtual host controller"
-	range 1 31
+	range 1 15
 	default 8
 	depends on USBIP_VHCI_HCD
 	---help---