Expand corpus, fix crash

test/core/end2end/fuzzers/api_fuzzer.c

...pi_fuzzer_corpus/0b08fc5a8eb4a23766be7b3082308959955d4b13

...pi_fuzzer_corpus/0c088a8261de0bf3b996cc1e7889399acb03fd5a

...pi_fuzzer_corpus/0e0ecc8214b5083b75216857b967621c0648afc9

...pi_fuzzer_corpus/16f798191df0c173217cdcb4ec8edd3e4f7fb99b

...pi_fuzzer_corpus/1a6119919790570e3c15bb371648fc7929c72ea2

...pi_fuzzer_corpus/21af47d84b1aa84e8b4021765203c8951239fe41

...pi_fuzzer_corpus/2339fcca7f93814c587aba47fff2210875a41f49

...pi_fuzzer_corpus/239b03041efe9bf24982b0ecbb66d5abea4a28d0

...pi_fuzzer_corpus/24d630240f673498d784cecb66d73e9b1d981493

...pi_fuzzer_corpus/2533c4ed207eed715756142667128f6eb01309e0

...pi_fuzzer_corpus/2b6a001c2274e347cbfc6fe2e3bf4f7d7e79f5fe

...pi_fuzzer_corpus/321e6127d6f5619c88e31037f7fdec581acf75e8

...pi_fuzzer_corpus/34052cc2fa2be6543184db85d0b9ad33ae17029c

...pi_fuzzer_corpus/3a07fd9ba009b9a57e298343e815abab13a16f5c

...pi_fuzzer_corpus/3a74f1be7106c7dea533a34bd8a88974f69a5d71

...pi_fuzzer_corpus/3f4ee68f1f22eabcd01c2a7c1c6c8ccc299aa97d

...pi_fuzzer_corpus/427392659bf3a945097c6c754a17d8c15e23816f

...pi_fuzzer_corpus/42e6fb19dac07a0cbe747dfc8f1c90bae1d58cec

...pi_fuzzer_corpus/44ec5dcc4133f1786084202bf41d877702ce9277