usb: xhci: refactor xhci_td_cleanup() to return void

usb: xhci: refactor xhci_td_cleanup() to return void

The function is modified to return 'void' instead of an integer since it
invariably returns '0'. Additionally, multiple functions which only
return xhci_td_cleanup() are also refactored to return void.

This change eliminates the need for callers to handle a return value that
does not convey meaningful information and improve code readability, as it
becomes immediately clear that the function does not produce a significant
output.

Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20241106101459.775897-29-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>