[jdk11u-dev] RFR: 8266173: -Wmaybe-uninitialized happens in jni_util.c

[Paul Hohensee]

Please review this GCC 11 compatibility backport. Applies cleanly except for copyright date.

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Commit messages:
 - Backport 4a9f2319c9cec5c2cc69aafe6abdf93aff120084

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/677/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=677&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266173
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/677.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/677/head:pull/677

PR: https://git.openjdk.java.net/jdk11u-dev/pull/677