RFR: 8315073: Zero build on macOS fails after JDK-8303852

[Hao Sun]

It might be one copy-and-paste error in JDK-8303852. Adding the missing opening brace would fix this build failure.

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Commit messages:
 - 8315073: Zero build on macOS fails after JDK-8303852

Changes: https://git.openjdk.org/jdk/pull/15443/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15443&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315073
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15443.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15443/head:pull/15443

PR: https://git.openjdk.org/jdk/pull/15443