Reduce AAC_MAX_FIBS to work around some yet-unidentified bugs in the handling of resources shortages.  The driver is now so fast that it can completely fill all 512 slots on the card, but for some reason only 511 slots are being allocated.  Anything that tries to go into the 512th slot gets silently lost.   Both bugs need to be fixed at a later date, but this should fix the reports of hangs in getblk and vinvalb.
Reduce AAC_MAX_FIBS to work around some yet-unidentified bugs in the
handling of resources shortages.  The driver is now so fast that it can
completely fill all 512 slots on the card, but for some reason only 511
slots are being allocated.  Anything that tries to go into the 512th
slot gets silently lost.   Both bugs need to be fixed at a later date,
but this should fix the reports of hangs in getblk and vinvalb.

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