Add missing Changelog entry

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/ChangeLog b/ChangeLog
index 2c90676..e51151a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -98,6 +98,8 @@
      Johan Malmgren and Johan Uppman Bruce from Sectra.
 
 Bugfix
+   * Fix an invalid (but nonzero) return code from mbedtls_pk_parse_subpubkey()
+     when the input has trailing garbage. Fixes #2512.
    * Fix build failure in configurations where MBEDTLS_USE_PSA_CRYPTO is
      enabled but ECDSA is disabled. Contributed by jdurkop. Fixes #3294.
    * Include the psa_constant_names generated source code in the source tree