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vmx: nanosec(): fix non-interruptable temporary, assign fasthz only once after xstart

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

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

@@ -17,14 +17,15 @@

 		return nsec() - xstart;

 	if(fasthz == 0){

-		if((fasthz = _tos->cyclefreq) == 0){

-			fasthz = ~0ULL;

+		if(_tos->cyclefreq){

+			cycles(&xstart);

+			fasthz = _tos->cyclefreq;

+		} else {

 			xstart = nsec();

+			fasthz = ~0ULL;

 			fprint(2, "cyclefreq not available, falling back to nsec()\n");

 			fprint(2, "you might want to disable aux/timesync\n");

 			return 0;

-		}else{

-			cycles(&xstart);

 		}

 	}

 	cycles(&x);