cleanup bug fix

AudioTrackMerge.c

@@ -111,7 +111,7 @@ int audioMixArbitary(int numOfAudios, AudioFile *files[], AudioFile *o_file) {
     for (int i = 0; i < numOfAudios; ++i) {
         audio_ctx[i] = open_audio_file(files[i]);
         if (audio_ctx[i] == NULL) {
-            printf("Failed to open audio file: %s", files[i]->filepath);
+            printf("Failed to open audio file: %s\n", files[i]->filepath);
             goto FAIL;
         }
     }
@@ -142,12 +142,16 @@ int audioMixArbitary(int numOfAudios, AudioFile *files[], AudioFile *o_file) {
     err = 1;
 
   CLEANUP:
-    audioStreamCtx_Release_free(&output_ctx);
+    if (output_ctx)
+        audioStreamCtx_Release_free(&output_ctx);
     for (int i = 0; i < numOfAudios; ++i) {
-        audioStreamCtx_Release_free(&audio_ctx[i]);
+        if (audio_ctx[i])
+            audioStreamCtx_Release_free(&audio_ctx[i]);
     }
     free(audio_ctx);
-    filterCtx_Release(&filter_ctx);
+    if (filter_ctx)
+        filterCtx_Release(&filter_ctx);
+
     return err;
 }