bug#23111: 25.0.92; logxor leading zero missed

["Andreas Röhler" <andreas.roehler@easy-emacs.de>]

(logxor 110 011) ==> 101 ; right
(logxor 110 101) ==> 11  ; leading zero is missed

;;

In GNU Emacs 25.0.92.1 (i686-pc-linux-gnu, GTK+ Version 2.24.25)
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