Deref pointer when using sizeof in x509_get_other_name

Fix for #2716.
diff --git a/ChangeLog b/ChangeLog
index a461008..23b62b4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -74,6 +74,7 @@
      irwir.
    * Enable Suite B with subset of ECP curves. Make sure the code compiles even
      if some curves are not defined. Fixes #1591 reported by dbedev.
+   * Fix partial zeroing in x509_get_other_name. Found and fixed by ekse, #2716.
 
 API Changes
    * Extend the MBEDTLS_SSL_EXPORT_KEYS to export the handshake randbytes,