ziparchive.c: Add missing free to za_read_entry() when there is an unexpected end of the zip file.

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#1 0x55e8db2d9085 in coda_za_read_entry third_party/stcorp_coda/libcoda/ziparchive.c:641:21
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  | #2 0x55e8db1ce8dc in parse_entry third_party/stcorp_coda/libcoda/coda-definition-parse.c:4170:9
  | #3 0x55e8db1cfab9 in read_definition_file third_party/stcorp_coda/libcoda/coda-definition-parse.c:4263:9
  | #4 0x55e8db1cf8a1 in coda_read_definitions third_party/stcorp_coda/libcoda/coda-definition-parse.c:4471:21
  | #5 0x55e8db187fa9 in LLVMFuzzerTestOneInput third_party/stcorp_coda/fuzz/coda_read_definitions_fuzzer.cc:19:3

testcase-6585686393356288.zip

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