Add ChangeLog entry for #3311: fix uninitialised variable

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/ChangeLog.d/make-cpp-check-happy.txt b/ChangeLog.d/make-cpp-check-happy.txt
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+Bugfix
+   * Fix false positive uninitialised variable reported by cpp-check.
+     Contributed by Sander Visser in #3311.