explicitly match validate result to ensure error is thrown

Author: joecaswell

src/blockchain_worker.erl

@@ -1208,9 +1208,9 @@ attempt_fetch_snap_source_snapshot(BaseUrl, SnapInfo) ->
     case validate_snapshot_file(SnapInfo) of
         {ok, Filename} ->
             {ok, Filename}
-        {invalid, Filename, Filepath ->
+        {invalid, Filename, Filepath} ->
             _ = do_snap_source_download(build_url(BaseUrl, Filename), Filepath),
-            validate_snapshot_file(SnapInfo)
+            {ok, _} = validate_snapshot_file(SnapInfo)
     end.
 
 validate_snapshot_file(#snapshot_info{height = Height, file_hash = Hash,