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devcons: fix write length of writebintime() (thanks BurnZeZ)

--- a/sys/src/9/port/devcons.c

+++ b/sys/src/9/port/devcons.c

@@ -913,7 +913,8 @@

 	vlong delta;

 	long period;

-	n--;

+	if(--n <= 0)

+		error(Ebadtimectl);

 	p = (uchar*)buf + 1;

 	switch(*buf){

 	case 'n':

@@ -938,7 +939,7 @@

 		todsetfreq(fasthz);

 		break;

 	}

-	return n;

+	return n+1;

 }

 void

-- 

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