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Insist that Flood grids must have non-zero size

--- a/flood.c

+++ b/flood.c

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

 {

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

         return "Grid must contain at least two squares";

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

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

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

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

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