Check if image does not require resizing

src/image.c

@@ -1275,6 +1275,8 @@ float bilinear_interpolate(image im, float x, float y, int c)
 
 image resize_image(image im, int w, int h)
 {
+    if (im.w == w && im.h == h) return copy_image(im);
+
     image resized = make_image(w, h, im.c);
     image part = make_image(w, im.h, im.c);
     int r, c, k;