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Map: reduce maximum size

validate_desc relies on being able to calculate 2*wh in an int, so the
maximum grid size is at most INT_MAX/2.

--- a/map.c

+++ b/map.c

@@ -255,7 +255,7 @@

 {

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

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

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

+    if (params->w > INT_MAX / 2 / params->h)

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

     if (params->n < 5)

 	return "Must have at least five regions";