libavcodec/wavpack.c:256: error: Uninitialized Value
  The value read from sl[_] was never initialized.

libavcodec/wavpack.c:256:9: 
254.     }
255.     if (ctx->stereo_in && ctx->hybrid_bitrate) {
256.         int balance = (sl[1] - sl[0] + br[1] + 1) >> 1;
             ^
257.         if (balance > br[0]) {
258.             br[1] = br[0] << 1;
