In 32 bits sqrt(val) + 1 can overflow, so some big primes still aren't recognized as such, for example 18446744073709551577 given in the commit message of factor.c r1.7 from NetBSD. Move the return type of usqrt() from u_int32_t to u_int64_t.

ok guenther, tom, otto

games/factor/factor.c

···
-/*	$OpenBSD: factor.c,v 1.29 2016/08/14 18:34:48 guenther Exp $	*/
+/*	$OpenBSD: factor.c,v 1.30 2016/09/01 10:48:38 tb Exp $	*/
 /*	$NetBSD: factor.c,v 1.5 1995/03/23 08:28:07 cgd Exp $	*/
 
 /*
···
 
 static void		pr_fact(u_int64_t);	/* print factors of a value */
 static void		pr_bigfact(u_int64_t);
-static u_int32_t	usqrt(u_int64_t);
+static u_int64_t	usqrt(u_int64_t);
 static void __dead	usage(void);
 
 int
···
 }
 
 /* Code taken from ping.c */
-static u_int32_t
+static u_int64_t
 usqrt(u_int64_t n)
 {
 	u_int64_t y, x = 1;
···
 		x /= 2;
 	} while (((y < x) && (x - y) > 1) || (y - x) > 1);
 
-	return (u_int32_t)x;
+	return x;
 }
 
 static void __dead