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Last-ditch maximum size limit for Twiddle

This makes sure that width * height <= INT_MAX, which it rather needs
to be.

--- a/twiddle.c

+++ b/twiddle.c

@@ -10,6 +10,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -210,6 +211,8 @@

 	return "Width must be at least the rotating block size";

     if (params->h < params->n)

 	return "Height must be at least the rotating block size";

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

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

     return NULL;

 }