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Last-ditch grid-size limit for Inertia

At least prevent integer overflow when constructing the grid.

--- a/inertia.c

+++ b/inertia.c

@@ -11,6 +11,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -202,6 +203,8 @@

      */

     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";

     /*

      * The grid construction algorithm creates 1/5 as many gems as