libavcodec/vp9dsp.c:1603: error: Uninitialized Value
  The value read from p4 was never initialized.

libavcodec/vp9dsp.c:1603:13: 
1601.             dst[strideb * -7] = (p7 + p7 + p7 + p7 + p7 + p7 + p7 + p6 * 2 +
1602.                                  p5 + p4 + p3 + p2 + p1 + p0 + q0 + 8) >> 4;
1603.             dst[strideb * -6] = (p7 + p7 + p7 + p7 + p7 + p7 + p6 + p5 * 2 +
                  ^
1604.                                  p4 + p3 + p2 + p1 + p0 + q0 + q1 + 8) >> 4;
1605.             dst[strideb * -5] = (p7 + p7 + p7 + p7 + p7 + p6 + p5 + p4 * 2 +
