lavfi: factorize freeing a link

libavfilter/avfilter.c

@@ -428,42 +428,40 @@ int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *in
 }
 #endif
 
-void avfilter_free(AVFilterContext *filter)
+static void free_link(AVFilterLink *link)
 {
-    int i;
-    AVFilterLink *link;
-
-    if (filter->graph)
-        ff_filter_graph_remove_filter(filter->graph, filter);
+    if (!link)
+        return;
 
-    if (filter->filter->uninit)
-        filter->filter->uninit(filter);
-
-    for (i = 0; i < filter->nb_inputs; i++) {
-        if ((link = filter->inputs[i])) {
     if (link->src)
         link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
-            ff_formats_unref(&link->in_formats);
-            ff_formats_unref(&link->out_formats);
-            ff_formats_unref(&link->in_samplerates);
-            ff_formats_unref(&link->out_samplerates);
-            ff_channel_layouts_unref(&link->in_channel_layouts);
-            ff_channel_layouts_unref(&link->out_channel_layouts);
-        }
-        av_freep(&link);
-    }
-    for (i = 0; i < filter->nb_outputs; i++) {
-        if ((link = filter->outputs[i])) {
     if (link->dst)
         link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
+
     ff_formats_unref(&link->in_formats);
     ff_formats_unref(&link->out_formats);
     ff_formats_unref(&link->in_samplerates);
     ff_formats_unref(&link->out_samplerates);
     ff_channel_layouts_unref(&link->in_channel_layouts);
     ff_channel_layouts_unref(&link->out_channel_layouts);
-        }
     av_freep(&link);
+}
+
+void avfilter_free(AVFilterContext *filter)
+{
+    int i;
+
+    if (filter->graph)
+        ff_filter_graph_remove_filter(filter->graph, filter);
+
+    if (filter->filter->uninit)
+        filter->filter->uninit(filter);
+
+    for (i = 0; i < filter->nb_inputs; i++) {
+        free_link(filter->inputs[i]);
+    }
+    for (i = 0; i < filter->nb_outputs; i++) {
+        free_link(filter->outputs[i]);
     }
 
     if (filter->filter->priv_class)