3c59x Ethernet Update for 2.1.4x

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> I was trying to upgrade to 2.1.40 (from 2.1.32) and ran into trouble
> compiling the ethernet boomerang driver 3c59x.c:
> ("3c900.c:v0.39 4/1/97 becker@cesdis.gsfc.nasa.gov\n")
>
> It uses set_bit from  and uses the result value.
>
> Kernel 2.1.37 changed the definition of set_bit to return void rather than int.
>
> This breaks 3c59x.c :-(
>

I received the advice to substitute set_bit by test_and_set_bit. That leads to the attached patch, and it seems to work fine so far.