Similar to gst_allocator_alloc(), use default GstD3D11Allocator when caller passes null allocator object Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2843>
Similar to gst_allocator_alloc(), use default GstD3D11Allocator when caller passes null allocator object Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2843>