image: fix missing export

Author: Acly

include/visp/image.h

@@ -101,7 +101,7 @@ struct image_data {
 VISP_API image_data image_alloc(i32x2 extent, image_format format);
 
 // Set all pixels to zero.
-void image_clear(image_span const&);
+VISP_API void image_clear(image_span const&);
 
 // Load image from file (PNG, JPEG, etc.)
 VISP_API image_data image_load(char const* filepath);

src/visp/vision.cpp

@@ -91,7 +91,7 @@ birefnet_model birefnet_load_model(char const* filepath, backend_device const& d
 
 image_data birefnet_compute(birefnet_model& model, image_view image) {
     i32x2 res = birefnet_image_extent(image.extent, model.params);
-    if (!model.input || res != model.params.image_extent) {
+    if (!model.graph || res != model.params.image_extent) {
         model.params.image_extent = res;
         model.graph = compute_graph_init(6 * 1024);