bug#23111: 25.0.92; logxor leading zero missed

[Andreas Röhler]

(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)
 of 2016-03-03
Windowing system distributor 'The X.Org Foundation', version 11.0.11604000
System Description:    Debian GNU/Linux 8.3 (jessie)

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  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
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Memory information:
((conses 8 159387 4604)
 (symbols 24 37793 0)
 (miscs 20 43 127)
 (strings 16 49999 5945)
 (string-bytes 1 716536)
 (vectors 8 12531)
 (vector-slots 4 449557 5660)
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 (intervals 28 235 13)
 (buffers 520 11)
 (heap 1024 38620 797))