RFR: 8302671: libawt has a memmove decay error

[Julian Waters]

In libawt, the size parameter is issued by a sizeof on an array, which as expected decays into a pointer and breaks the cleanup code by giving the incorrect size

-------------

Commit messages:
 - Brackets
 - memmove decay error

Changes: https://git.openjdk.org/jdk/pull/12597/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12597&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302671
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12597.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12597/head:pull/12597

PR: https://git.openjdk.org/jdk/pull/12597