Revert "usb: xhci: prevent potential failure in handle_tx_event() for Transfer events without TRB"

This reverts commit 9a24eb80 which is
commit 66cb618b upstream.

In backporting it to stable kernels, it causes a severe regression on
many systems, so revert it for now.

Reported-by: Tim Lewis <elatllat@gmail.com>
Link: https://lore.kernel.org/r/CA+3zgmvct7BWib9A7O1ykUf=0nZpdbdpXBdPWOCqfPuyCT3fug@mail.gmail.com


Reported-by:  <matthias@bodenbinder.de>
Link: https://lore.kernel.org/r/bug-219039-208809@https.bugzilla.kernel.org/


Cc: Niklas Neronin <niklas.neronin@linux.intel.com>
Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: Michał Pecio <michal.pecio@gmail.com>
Cc: <ZeroBeat@gmx.de>
Cc: Salvatore Bonaccorso <carnil@debian.org>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>