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astro: ensure we null-terminate timezone names

--- a/sys/src/cmd/astro/pdate.c

+++ b/sys/src/cmd/astro/pdate.c

@@ -234,7 +234,7 @@

 	/*

 	 * return difference

 	 */

-	strncpy(z->tz, t1.zone, sizeof(z->tz));

+	snprint(z->tz, sizeof(z->tz), t1.zone);

 	return y + (l2 - l1);

 }

-- 

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