USB: xhci: Fix error path when configuring endpoints.

If we fail to queue an evaluate context command or a configure endpoint
command to the command ring in xhci_configure_endpoint(), we need to
remove the xhci_command structure from the device's command list before
returning.  If the command is left on the command list, it will sit there
indefinitely, blocking commands submitted after this fails.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/xhci-hcd.c

@@ -1181,6 +1181,8 @@ static int xhci_configure_endpoint(struct xhci_hcd *xhci,
 		ret = xhci_queue_evaluate_context(xhci, in_ctx->dma,
 				udev->slot_id);
 	if (ret < 0) {
+		if (command)
+			list_del(&command->cmd_list);
 		spin_unlock_irqrestore(&xhci->lock, flags);
 		xhci_dbg(xhci, "FIXME allocate a new ring segment\n");
 		return -ENOMEM;