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bcm: apply richards fix for mmukmap (from /n/sources/patch/bcm-mmukmap-bug)

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

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

@@ -305,7 +305,7 @@

 		*pte++ = (pa+n)|Dom0|L1AP(Krw)|Section;

 		mmuinvalidateaddr(va+n);

 	}

-	cachedwbse(pte0, pte - pte0);

+	cachedwbse(pte0, (uintptr)pte - (uintptr)pte0);

 	return va + o;

 }