bug#23096: 25.0.92; Pinentry fails to tidy up its buffer

[N. Jackson]

After the user is prompted for a password, the *Pinentry* buffer
containing the password prompt is buried rather than closed.

This clutters up the buffer list for the remainder of the session, and
it is confusing, when switching buffers possibly days later, to suddenly
see the old password prompt.

It would be much better, I think, if the *Pinentry* buffer was killed
rather buried after password entry.



In GNU Emacs 25.0.92.3 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
 of 2016-03-21 built on moondust
Windowing system distributor 'Fedora Project', version 11.0.11801000
System Description:     Fedora release 23 (Twenty Three)

Configured using:
 'configure --prefix=/usr/local/ --enable-checking=yes,glyphs
 --enable-check-lisp-object-type 'CFLAGS=-O0 -g3 -gdwarf-4''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: en_DK.utf8
  value of $LC_NUMERIC: en_DK.utf8
  value of $LC_TIME: en_DK.utf8
  value of $LANG: en_CA.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Summary

Minor modes in effect:
  diff-auto-refine-mode: t
  TeX-PDF-mode: t
  recentf-mode: t
  display-battery-mode: t
  display-time-mode: t
  delete-selection-mode: t
  show-paren-mode: t
  savehist-mode: t
  save-place-mode: t
  electric-pair-mode: t
  desktop-save-mode: t
  cua-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  temp-buffer-resize-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t
  completion-in-region-mode: t

Recent messages:
Suppressing duplicates...done
Sorting articles...done
Generating summary...done
Updating buffer list...done
Making completion list...
mwheel-scroll: Beginning of buffer
Making completion list...
Quit
ESC <mouse-4> is undefined
mwheel-scroll: Beginning of buffer [2 times]

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Features:
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Memory information:
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