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bcm64: don't zap idmap, not in L1 anymore

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

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

@@ -246,11 +246,8 @@

 	 * the proper sizes.

 	 */

 	coherence();

-	for(va = INITMAP+KZERO; va != 0; va += PGLSZ(1)){

-		pa = va-KZERO;

-		((uintptr*)L1)[PTL1X(pa, 1)] = 0;

+	for(va = INITMAP+KZERO; va != 0; va += PGLSZ(1))

 		((uintptr*)L1)[PTL1X(va, 1)] = 0;

-	}

 	flushtlb();

 	pa = PGROUND((uintptr)end)-KZERO;