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fmt: prevent divide by zero when \n(.v is zero

Reported by Dirk-Wilhelm Peters <peters@schwertfisch.de>.

--- a/fmt.c

+++ b/fmt.c

@@ -631,7 +631,7 @@

 static int fmt_safelines(void)

 {

 	int lnht = MAX(1, n_L) * n_v;

-	return (f_nexttrap() + lnht - 1) / lnht;

+	return n_v > 0 ? (f_nexttrap() + lnht - 1) / lnht : 1000;

 }

 /* fill the words collected in the buffer */