FS-11450 [mod_conference] Fix for memory leak when conference json list api command is executed

src/mod/applications/mod_conference/conference_api.c

@@ -4084,6 +4084,8 @@ switch_status_t conference_api_sub_json_list(conference_obj_t *conference, switc
 	switch_assert(ebuf);
 	stream->write_function(stream, "%s", ebuf);
 	free(ebuf);
+	
+	cJSON_Delete(conferences);
 
 	return SWITCH_STATUS_SUCCESS;
 }