xhci: Avoid queuing redundant Stop Endpoint command for stalled endpoint

xhci: Avoid queuing redundant Stop Endpoint command for stalled endpoint

If EP_STALLED flag is set in xhci_urb_dequeue(), without EP_HALTED or
SET_DEQ_PENDING flags, then the endpoint is in stopped state and the
cancelled URB can be given back immediately withouth queueing
a 'stop endpoint' command.

Without this change the cancelled URB would eventually be given back
in the 'context state error' completion path of the 'stop endpoint'
command. This is not optimal.

For this improvement to work the EP_STALLED flag must be cleared with
xhci lock held.

Suggested-by: Michal Pecio <michal.pecio@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20250311154551.4035726-2-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>