[TG3] Initialise reset_task properly

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Hi Jeff:

I've received a queue_work crash report due to reset_task in tg3 not being
initialised correctly.  This patch should fix it.

Cheers,
-- 
Debian GNU/Linux 3.0 is out! ( http://www.debian.org/ )
Email:  Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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