Fix bug number.

debian/changelog

@@ -6,7 +6,7 @@ dpkg (1.13.14~) UNRELEASED; urgency=low
     start-stop-daemon. Closes: #295169, #267784
   * Cleanup and unify program usage and version output, make it more i18n
     friendly. Fix wrong gettext usage with interparsed macros.
-    Thanks to Changwoo Ryu for noticing. Closes: #23791
+    Thanks to Changwoo Ryu for noticing. Closes: #237915
   * Mark some strings as translatable (Changwoo Ryu). Closes: #256387
   * Remove a trailing 'C' character from update-alternatives manpage.