fix(video): try to optimize memory leaks

crates/iced-video/src/primitive.rs

@@ -99,11 +99,14 @@ impl iced_wgpu::Primitive for VideoFrame {
         if video.ready.load(std::sync::atomic::Ordering::SeqCst) {
             let now = std::time::Instant::now();
             let frame = self.frame.lock().expect("BUG: Mutex poisoned");
-            let frame = frame
+            let buffer = frame
                 .buffer()
-                .and_then(|b| b.map_readable().ok())
                 .expect("BUG: Failed to get frame data from gst::Sample");
-            queue.write_buffer(&video.buffer, 0, &frame);
+
+            let data = buffer
+                .map_readable()
+                .expect("BUG: Failed to map gst::Buffer readable");
+            queue.write_buffer(&video.buffer, 0, &data);
             video
                 .ready
                 .store(false, std::sync::atomic::Ordering::SeqCst);