proj4/standard_fuzzer: Stack-use-after-return in forward_4d

Detailed report: https://oss-fuzz.com/testcase?key=5020564482686976 Project: proj4 Fuzzer: libFuzzerproj4standardfuzzer Fuzz target binary: standardfuzzer Job Type: libfuzzerasanproj4 Platform Id: linux Crash Type: Stack-use-after-return READ 8 Crash Address: 0x7fe98cc70c20 Crash State: forward4d...