Update changelog to close a bug reporting a problem already fixed

debian/changelog

@@ -33,6 +33,7 @@ dpkg (1.16.1) UNRELEASED; urgency=low
   * Check presence of required parameters in dpkg-vendor. Closes: #628726
     Thanks to Niels Thykier <niels@thykier.net> for the patch.
   * Avoid a Perl warning in dpkg-buildflags when HOME is not set.
+    Closes: #635467
   * dpkg-source can now also use debian/source/local-patch-header (that is not
     included in the generated source package) instead of
     debian/source/patch-header. Closes: #629582