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Last-ditch grid-size limit for Flood

At least prevent integer overflow when constructing the grid.

--- a/flood.c

+++ b/flood.c

@@ -31,6 +31,7 @@

 #include <string.h>

 #include <assert.h>

 #include <ctype.h>

+#include <limits.h>

 #include <math.h>

 #include "puzzles.h"

@@ -209,6 +210,8 @@

 {

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

         return "Grid must contain at least two squares";

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

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

     if (params->colours < 3 || params->colours > 10)

         return "Must have between 3 and 10 colours";

     if (params->leniency < 0)