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Fix scan_build_warnings in comp_avg_pred_test.cc

BUG=webm:1575

Change-Id: I9b5f8b08d23fd62ff6400605023f33e3890b0f2d

--- a/test/comp_avg_pred_test.cc

+++ b/test/comp_avg_pred_test.cc

@@ -29,6 +29,11 @@

 void reference_pred(const Buffer<uint8_t> &pred, const Buffer<uint8_t> &ref,

                     int width, int height, Buffer<uint8_t> *avg) {

+  if (avg->TopLeftPixel() == NULL || pred.TopLeftPixel() == NULL ||

+      ref.TopLeftPixel() == NULL) {

+    assert(0);

+    return;

+  }

   for (int y = 0; y < height; ++y) {

     for (int x = 0; x < width; ++x) {

       avg->TopLeftPixel()[y * avg->stride() + x] =