Restore initialization of ahc->unpause lost in rev 1.76.  ahc->unpause should be initialized to 0 for PCI adapters which was a side-effect of the memset in ahc_alloc().  EISA/VL adapters require our unpause value to include the "levelness" of our interrupt.
Restore initialization of ahc->unpause lost in rev 1.76.  ahc->unpause
should be initialized to 0 for PCI adapters which was a side-effect of
the memset in ahc_alloc().  EISA/VL adapters require our unpause value to
include the "levelness" of our interrupt.

This change allows EISA adapters to work again.

PR: 29689, 29471

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase