Fix fuzzer bug, add corpora

test/core/end2end/fuzzers/api_fuzzer.c

...pi_fuzzer_corpus/06c714e289673cf982ce2ac0670707a15f2ac5ea

...pi_fuzzer_corpus/1d7bd5961f6963c65054fb9a24d913601f37bf3d

...pi_fuzzer_corpus/205dd562c7202d4231b232a6804889e77eba5292

...pi_fuzzer_corpus/22c9ed2979d9963bce6500997f1e0433988e7e37

...pi_fuzzer_corpus/4236180c7d6f2edba5355b79bbe1a5c16266dd95

...pi_fuzzer_corpus/4667156173c437c62fdea99a199f3aed0b504fe0

...pi_fuzzer_corpus/48f56289592da153b3c50bcc26ad6d4d3a7e443b

...pi_fuzzer_corpus/4d800cf62e39478c1bc1db8222a8d810fff6ad85

...pi_fuzzer_corpus/5515fa05b890973031b0e2cc8c2925f3974e2821

...pi_fuzzer_corpus/5a1d370abacb9f46fa966c8e58992897606a7900

...pi_fuzzer_corpus/6531f1c311678c9247ad6820519bc7e73f56cb81

...pi_fuzzer_corpus/6ce9895c780428861d12440946508c6641352544

...pi_fuzzer_corpus/7b4b493ac5a36d3b3fed0b66bc504206548a3537

...pi_fuzzer_corpus/9d004fd9a35647ba7ec169e6fedbf9dce5f9623f

...pi_fuzzer_corpus/aff1fdfe79c104bce110cec92e1e021caf012fde

...pi_fuzzer_corpus/dfe4f327699ddea25103dd17b68e9a0fb726f4a7

...pi_fuzzer_corpus/fe565289309a897d640309b9bf214d3036c2216b

test/core/end2end/fuzzers/api_fuzzer_corpus/full_request.bin