libavcodec/aacdec.c:2391: error: Uninitialized Value
  The value read from err was never initialized.

libavcodec/aacdec.c:2391:13: 
2389.         elem_type_prev = elem_type;
2390. 
2391.         if (err)
                  ^
2392.             return err;
2393. 
