libavcodec/vp8dsp.c:167: error: Uninitialized Value
  The value read from q0 was never initialized.

libavcodec/vp8dsp.c:167:54: 
165.     return simple_limit(p, stride, E)
166.         && FFABS(p3-p2) <= I && FFABS(p2-p1) <= I && FFABS(p1-p0) <= I
167.         && FFABS(q3-q2) <= I && FFABS(q2-q1) <= I && FFABS(q1-q0) <= I;
                                                          ^
168. }
169. 
