crocus: fail resource allocation properly.

Older gens have a limit of 2GB on surfaces, this results in
isl_surf_init_s failing if the surface exceeds that, in this
case this should fail all the way back up the stack.

This fixes some cases of max-texture-size on crocus

Fixes: f3630548f1 ("crocus: initial gallium driver for Intel gfx 4-7")

Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14347>

src/gallium/drivers/crocus/crocus_resource.c

@@ -688,9 +688,10 @@ crocus_resource_create_with_modifiers(struct pipe_screen *pscreen,
        devinfo->ver < 6)
       return NULL;
 
-   UNUSED const bool isl_surf_created_successfully =
+   const bool isl_surf_created_successfully =
       crocus_resource_configure_main(screen, res, templ, modifier, 0);
-   assert(isl_surf_created_successfully);
+   if (!isl_surf_created_successfully)
+      return NULL;
 
    const char *name = "miptree";