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Also check for tiny grids in Mines

A zero-size grid isn't acceptable even if someone has generated it for
us.

--- a/mines.c

+++ b/mines.c

@@ -261,6 +261,8 @@

      */

     if (full && params->unique && (params->w <= 2 || params->h <= 2))

 	return "Width and height must both be greater than two";

+    if (params->w < 1 || params->h < 1)

+	return "Width and height must both be at least one";

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

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

     if (params->n < 0)