proj4/standard_fuzzer: Crash in reverse_4d

Detailed report: https://oss-fuzz.com/testcase?key=6162480330964992

Project: proj4
Fuzzer: libFuzzer_proj4_standard_fuzzer
Fuzz target binary: standard_fuzzer
Job Type: libfuzzer_asan_proj4
Platform Id: linux

Crash Type: UNKNOWN WRITE
Crash Address: 0x7fbe21623158
Crash State:
reverse_4d
pj_inv4d
proj_trans

Sanitizer: address (ASAN)

Recommended Security Severity: High

Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_asan_proj4&range=201711010559:201711020555

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=6162480330964992

Issue filed automatically.

See https://github.com/google/oss-fuzz/blob/master/docs/reproducing.md for more information.

This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without an upstream patch, then the bug report will automatically
become visible to the public.

When you fix this bug, please

• mention the fix revision(s).
• state whether the bug was a short-lived regression or an old bug in any stable releases.
• add any other useful information.
  This information can help downstream consumers.

If you have questions for the OSS-Fuzz team, please file an issue at https://github.com/google/oss-fuzz/issues.