Fix bug closure

Thinko in commit a3c68a75e0c9ad861666197bca55b900bf75b9e4.

Closes: #560010

debian/changelog

@@ -26,7 +26,7 @@ dpkg (1.15.6) UNRELEASED; urgency=low
     mode and owner of the file. This would fail later on when dpkg itself
     applies the overrides, so better to signal this earlier.
   * Add sparc64 to cputable. Thanks to Aurelien Jarno <aurel32@debian.org>.
-    Closes: #523456
+    Closes: #560010
   * Do not allow diverting a file to itself, which makes the file to get
     removed. Closes: #312206