Fix nits. (#423)

* Fix order of args to string constructor.
* Fix fuzzer.

Author: g-easy

opencensus/tags/internal/grpc_tags_bin_fuzzer.cc

@@ -17,7 +17,7 @@
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
   absl::string_view input(reinterpret_cast<const char *>(Data), Size);
-  TagMap m({});
+  opencensus::tags::TagMap m({});
   opencensus::tags::propagation::FromGrpcTagsBinHeader(input, &m);
   return 0;
 }

opencensus/tags/internal/grpc_tags_bin_test.cc

@@ -147,7 +147,7 @@ TEST(GrpcTagsBinTest, SerializeTooLong) {
   int key_n = 0;
   while (out_len < 8192) {
     const std::string k = absl::StrCat("key_", key_n++);
-    tags.emplace_back(TagKey::Register(k), std::string('A', kValLen));
+    tags.emplace_back(TagKey::Register(k), std::string(kValLen, 'A'));
     out_len += 1 + 1 + k.size() + 1 + kValLen;
   }
   TagMap m(std::move(tags));

tools/fuzz.sh

@@ -22,7 +22,7 @@ set -e
 set -x
 cmake -H. -B.build -DBUILD_TESTING=OFF -DCMAKE_CXX_COMPILER=clang-6.0 \
   -DFUZZER=-fsanitize=fuzzer \
-  -DCMAKE_CXX_FLAGS="-fsanitize=fuzzer-no-link,address -g -O2 -fno-exceptions"
+  -DCMAKE_CXX_FLAGS="-fsanitize=fuzzer-no-link,address -g -O2"
 cmake --build .build
 ./.build/opencensus/tags/opencensus_tags_grpc_tags_bin_fuzzer \
   opencensus/tags/internal/grpc_tags_bin_corpus -runs=0