avfilter/avfilter: fix OOM case for default activate

Fixes OOM when caller keeps adding frames into filtergraph
that reached EOF by other means, for example EOF is signalled
by other filter in filtergraph or by buffersink.

libavfilter/avfilter.c

@@ -1167,6 +1167,16 @@ static int ff_filter_activate_default(AVFilterContext *filter)
 {
     unsigned i;
 
+    for (i = 0; i < filter->nb_outputs; i++) {
+        int ret = filter->outputs[i]->status_in;
+
+        if (ret) {
+            for (int j = 0; j < filter->nb_inputs; j++)
+                ff_inlink_set_status(filter->inputs[j], ret);
+            return 0;
+        }
+    }
+
     for (i = 0; i < filter->nb_inputs; i++) {
         if (samples_ready(filter->inputs[i], filter->inputs[i]->min_samples)) {
             return ff_filter_frame_to_filter(filter->inputs[i]);