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plan9: nanosec: remove wrap around, it doesn't make sense

--- a/plan9.c

+++ b/plan9.c

@@ -650,12 +650,12 @@

 			e = tmp;

 			for (i = 0; i < 3; i++)

 				strtoll(e, &e, 10);

-			fasthz = strtoll(e, nil, 10);

-			if (fasthz < 1)

+			if ((fasthz = strtoll(e, nil, 10)) < 1)

 				fasthz = ~0ULL;

-			close(f);

-			cycles(&xstart);

+			else

+				cycles(&xstart);

 		}

+		close(f);

 		if (fasthz == ~0ULL) {

 			fprint(2, "couldn't get fasthz, falling back to nsec()\n");

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

@@ -664,10 +664,6 @@

 		}

 	}

 	cycles(&x);

-	if (x < xstart) { /* wrap around */

-		x += 0 - xstart;

-		xstart = 0;

-	}

 	x -= xstart;

 	for (div = 1000000000ULL; x < 0x1999999999999999ULL && div > 1 ; div /= 10ULL, x *= 10ULL);