libavcodec/4xm.c:619: error: Uninitialized Value
  The value read from flag[_] was never initialized.

libavcodec/4xm.c:619:13: 
617. 
618.         for (node = j; up[node] != -1; node = up[node]) {
619.             bits += flag[node] << len;
                 ^
620.             len++;
621.             if (len > 31)
