bridge_softmix: Note why ast_stream_topology_set_stream cannot fail.

This appeared in my audit of ast_stream_topology_set_stream callers
not checking for errors but in this situation the call cannot fail.
Add comment so this can be ignored in the future.

Change-Id: I91d25704859efbe50b8b82cfe1cd3c40ba177c9f

diff --git a/bridges/bridge_softmix.c b/bridges/bridge_softmix.c
index f490967e2aca2bc751edc1ca8057fee237c0c28c..8de88f257ca88350108e2bcab9299255a2992646 100644 (file)
--- a/bridges/bridge_softmix.c
+++ b/bridges/bridge_softmix.c
@@ -541,6 +541,8 @@ static int append_all_streams(struct ast_stream_topology *dest,
                        dest_index++;
 
                        if (ast_stream_get_state(stream) == AST_STREAM_STATE_REMOVED) {
+                               /* This cannot fail because dest_index - 1 is less than the
+                                * current count in dest. */
                                ast_stream_topology_set_stream(dest, dest_index - 1, clone);
                                added = 1;
                                break;