[lvc-project] [PATCH 5.10] Revert "USB: serial: keyspan_pda: fix information leak"

[Sasha Levin]

> This reverts commit cccef1711efbcdbe999738ac27d37b9ef6271abd which is
> commit 6bfc8d01ac4068eced509f8fc74d0cd205e4dcec upstream.
>
> The 5.10 backport is incorrect - instead of keyspan_pda_write_start() it
> touches the wrong function keyspan_pda_write() which now returns an
> incorrect number of buffered bytes.

Queued for 5.10, thanks.

-- 
Thanks,
Sasha