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Last-ditch grid-size limit for Fifteen

At least prevent integer overflow when constructing the grid.

--- a/fifteen.c

+++ b/fifteen.c

@@ -7,6 +7,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -138,6 +139,8 @@

 {

     if (params->w < 2 || params->h < 2)

 	return "Width and height must both be at least two";

+    if (params->w > INT_MAX / params->h)

+        return "Width times height must not be unreasonably large";

     return NULL;

 }