RFR: 8308408: Build failure with -Werror=maybe-uninitialized in libjli/java.c with GCC8

[Jie Fu]

May I get review for this change which fixes the build broken with GCC8?
Thanks.

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Commit messages:
 - 8308408: Build failure with -Werror=maybe-uninitialized in libjli/java.c with GCC8

Changes: https://git.openjdk.org/jdk/pull/14057/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14057&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308408
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/14057.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14057/head:pull/14057

PR: https://git.openjdk.org/jdk/pull/14057