cleanup update

AudioTrackMerge.c

@@ -103,6 +103,7 @@ void filterCtx_Release(FilteringContext **f_ctx) {
 int audioMixArbitary(int numOfAudios, AudioFile *files[], AudioFile *o_file) {
 
     int err = 0;
+    FilteringContext *filter_ctx = NULL;
     AudioStreamingContext *output_ctx;
     AudioStreamingContext **audio_ctx =
         (AudioStreamingContext**)calloc(1, numOfAudios*sizeof(AudioStreamingContext));
@@ -124,7 +125,7 @@ int audioMixArbitary(int numOfAudios, AudioFile *files[], AudioFile *o_file) {
     }
 
     /* Create filter graph */
-    FilteringContext *filter_ctx = create_filter_context(numOfAudios, audio_ctx);
+    filter_ctx = create_filter_context(numOfAudios, audio_ctx);
     if (filter_ctx == NULL) {
         printf("Failed to create filter context\n");
         goto FAIL;