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pc64: cleanup mmuzap

--- a/sys/src/9/pc64/mmu.c

+++ b/sys/src/9/pc64/mmu.c

@@ -339,17 +339,13 @@

 	m->mmumap[PTLX(TSTKTOP, 3)/MAPBITS] &= ~(1ull<<(PTLX(TSTKTOP, 3)%MAPBITS));

 	for(i = 0; i < nelem(m->mmumap); pte += MAPBITS, i++){

-		w = m->mmumap[i];

-		if(w == 0)

+		if((w = m->mmumap[i]) == 0)

 			continue;

-		x = 0;

-		do {

+		m->mmumap[i] = 0;

+		for(x = 0; w != 0; w >>= 1, x++){

 			if(w & 1)

 				pte[x] = 0;

-			x++;

-			w >>= 1;

-		} while(w);

-		m->mmumap[i] = 0;

+		}

 	}

 }