libavcodec/xl.c:81: error: Uninitialized Value
  The value read from y3 was never initialized.

libavcodec/xl.c:81:17: 
79.                 y0 = (val & 0x1F) << 2;
80.             else
81.                 y0 = y3 + xl_table[val & 0x1F];
                    ^
82.             val >>= 5;
83.             y1 = y0 + xl_table[val & 0x1F];
