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vmx: set xstart to either nsec or cycles depending on what is available

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

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

@@ -6,9 +6,6 @@

  * nsec() is wallclock and can be adjusted by timesync

  * so need to use cycles() instead, but fall back to

  * nsec() in case we can't

- *

- * "fasthz" is how many ticks there are in a second

- * can be read from /dev/time

  */

 uvlong

 nanosec(void)

@@ -20,12 +17,14 @@

 		return nsec() - xstart;

 	if(fasthz == 0){

-		xstart = nsec();

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

 			fasthz = ~0ULL;

+			xstart = nsec();

 			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);