decode_test_driver: check HasFailure() in RunLoop

avoids unnecessary errors due to e.g., read (Next()) failures

Change-Id: I70b1d09766456f1c55367d98299b5abd7afff842
diff --git a/test/decode_test_driver.cc b/test/decode_test_driver.cc
index 2defacc..12da25f 100644
--- a/test/decode_test_driver.cc
+++ b/test/decode_test_driver.cc
@@ -31,7 +31,8 @@
   ASSERT_TRUE(decoder != NULL);
 
   // Decode frames.
-  for (video->Begin(); video->cxdata(); video->Next()) {
+  for (video->Begin(); !::testing::Test::HasFailure() && video->cxdata();
+       video->Next()) {
     PreDecodeFrameHook(*video, decoder);
     vpx_codec_err_t res_dec = decoder->DecodeFrame(video->cxdata(),
                                                    video->frame_size());