RFR: 8320679: [JVMCI] invalid code in PushLocalFrame event message

[Doug Simon]

This is a trivial fix to the JVMCI event logged when PushLocalFrame fails in a new libjvmci env. It must report the value of `result`, not `_init_error`.

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Commit messages:
 - use correct variable containing PushLocalFrame return code

Changes: https://git.openjdk.org/jdk/pull/16803/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16803&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320679
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16803.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16803/head:pull/16803

PR: https://git.openjdk.org/jdk/pull/16803