fuzz CAA parsing (#363)

Add fuzz support for CAA parsing

Fix By: David Hotham (@dimbleby)

test/ares-test-fuzz.c

@@ -47,5 +47,9 @@ int LLVMFuzzerTestOneInput(const unsigned char *data,
   ares_parse_naptr_reply(data, size, &naptr);
   if (naptr) ares_free_data(naptr);
 
+  struct ares_caa_reply* caa = NULL;
+  ares_parse_caa_reply(data, size, &caa);
+  if (caa) ares_free_data(caa);
+
   return 0;
 }

travis/test.sh

@@ -31,8 +31,7 @@ $TEST_WRAP "${TOOLSBIN}/acountry" www.google.com
 $TEST_WRAP "${TOOLSBIN}/ahost" www.google.com
 cd "${TESTSBIN}"
 $TEST_WRAP ./arestest -4 -v $TEST_FILTER
-./aresfuzz "${TESTDIR}/fuzzinput/*"
-./aresfuzzname "${TESTDIR}/fuzznames/*"
+./aresfuzz ${TESTDIR}/fuzzinput/*
+./aresfuzzname ${TESTDIR}/fuzznames/*
 ./dnsdump "${TESTDIR}/fuzzinput/answer_a" "${TESTDIR}/fuzzinput/answer_aaaa"
 cd "${PWD}"
-