xhci: use xhci_td_cleanup() helper when giving back cancelled URBs

use the existing xhci_td_cleanup() to give back cancelled TDs when a
ring is stopped.

A minor change to make sure we don't try to remove an already removed
td from the list is needed as cancelled TDs are already removed from the
td_list immediatelty when it's cancelled.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210129130044.206855-18-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>