rfnoc: Add shutdown feature to blocks

On destruction, the rfnoc_graph will call shutdown() on all blocks. This
allows a safe de-initialization of blocks independent of the lifetime of
the noc_block_base::sptr.

Also adds the shutdown feature to null_block_control.

1 files changed, 1 insertions, 0 deletions

diff --git a/host/lib/rfnoc/rfnoc_graph.cpp b/host/lib/rfnoc/rfnoc_graph.cpp
index 201920366..5b2277284 100644
--- a/host/lib/rfnoc/rfnoc_graph.cpp
+++ b/host/lib/rfnoc/rfnoc_graph.cpp
@@ -38,6 +38,7 @@ public:
     ~rfnoc_graph_impl()
     {
         _graph.reset();
+        _block_registry->shutdown();
     }
 
     /**************************************************************************