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Loopy: free the grid description string if it's invalid

--- a/loopy.c

+++ b/loopy.c

@@ -777,10 +777,13 @@

      * know is the precise number of faces. */

     grid_desc = extract_grid_desc(&desc);

     ret = grid_validate_desc(grid_types[params->type], params->w, params->h, grid_desc);

-    if (ret) return ret;

+    if (ret) {

+        sfree(grid_desc);

+        return ret;

+    }

     g = loopy_generate_grid(params, grid_desc);

-    if (grid_desc) sfree(grid_desc);

+    sfree(grid_desc);

     for (; *desc; ++desc) {

         if ((*desc >= '0' && *desc <= '9') || (*desc >= 'A' && *desc <= 'Z')) {