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bcm64: fix mmu0clear() mistake from previous commit

--- a/sys/src/9/bcm64/mmu.c

+++ b/sys/src/9/bcm64/mmu.c

@@ -53,7 +53,6 @@

 	pe = PHYSDRAM + soc.dramsize;

-	if(PTLEVELS > 3)

 	for(pa = PHYSDRAM, va = KZERO; pa < pe; pa += PGLSZ(1), va += PGLSZ(1)){

 		if(PTL1X(pa, 1) != PTL1X(va, 1))

 			l1[PTL1X(pa, 1)] = 0;

@@ -63,6 +62,7 @@

 		if(PTL1X(pa, 2) != PTL1X(va, 2))

 			l1[PTL1X(pa, 2)] = 0;

 	}

+	if(PTLEVELS > 3)

 	for(pa = PHYSDRAM, va = KZERO; pa < pe; pa += PGLSZ(3), va += PGLSZ(3)){

 		if(PTL1X(pa, 3) != PTL1X(va, 3))

 			l1[PTL1X(pa, 3)] = 0;