Function block_server_delete_async 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn block_server_delete_async(
    block_server: *const BlockServer,
    callback: unsafe extern "C" fn(*mut c_void),
    arg: *mut c_void,
)

Safety

block_server must be valid and either block_server_delete or block_server_delete_async may only be called once.