more iterations in png test
more iterations in png test

dnoursi/fuzzer-test-suite,dnoursi/fuzzer-test-suite,bshastry/fuzzer-test-suite,dnoursi/fuzzer-test-suite,dnoursi/fuzzer-test-suite,dnoursi/fuzzer-test-suite,bshastry/fuzzer-test-suite,bshastry/fuzzer-test-suite,google/fuzzer-test-suite,google/fuzzer-test-suite,google/fuzzer-test-suite