Input: xpad - return errors from xpad_try_sending_next_out_packet() up

Not all errors that occur in xpad_try_sending_next_out_packet() are
IO errors. Pass up the error code to the caller so that it can
decide what to do.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20250609014718.236827-3-superm1@kernel.org


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>