This fixes the problem with SMC NE2000 cards hanging the box on

bootup.  Somehow my backout of an abortaive attempt at shared
memory autoconfiguration included this line:

        sc->mem_shared = 1;

Which is fairly important as it turns out.

Since I performed my pre-commit testing on a different box with a generic
NE2000 I didn't catch this.  Pointy hat.

sys/dev/ed/if_ed.c

@@ -474,6 +474,7 @@ ed_probe_WD80x3(dev)
 		return (ENXIO);
 	}
 	sc->isa16bit = isa16bit;
+	sc->mem_shared = 1;
 
 	error = ed_alloc_memory(dev, 0, memsize);
 	if (error) {