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vmx(1): fix translateflat on 64-bit

--- a/sys/src/cmd/vmx/x86.c

+++ b/sys/src/cmd/vmx/x86.c

@@ -16,10 +16,11 @@

 static uintptr

 translateflat(uintptr va, uintptr *pa, uintptr)

 {

+	if(sizeof(uintptr) != 4 && va >> 32 != 0) return 0;

 	*pa = va;

 	if(va == 0)

-		return -1;

-	return 0;

+		return 0xFFFFFFFFUL;

+	return -va;

 }

 static uintptr