Tentitive (untested) ISA DMA space allocation fix.

[Matthew Dillon]

:I can see on the screen were something seems to be continually calling
:twe_print_controller() because of the printout on the screen. 
:Interestingly
:enough the free count drops and the busy goes up and when the free count
:gets to 194 every time now the machine resets its self....
:
:
:-DR

    Maybe it is assuming that malloc() is returning zero'd data without
    passing M_ZERO.  Just for the hell of it, try adding M_ZERO to all
    the malloc() calls.

					-Matt
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>