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plan9: nanosec: call nsec _or_ cycles

--- a/plan9.c

+++ b/plan9.c

@@ -502,12 +502,14 @@

 		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);