ohci: allocate timer only once.
Allocate timer once, at init time, instead of allocating/freeing it all the time when starting/stopping the bus. Simplifies the code, also fixes bugs (memory leak) due to missing checks whenever the time is already allocated or not. Cc: Prasad J Pandit <pjp@fedoraproject.org> Reported-by: NZuozhi Fzz <zuozhi.fzz@alibaba-inc.com> Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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