bug#14075: 24.3.50; Escaped parentheses break sh-mode indentation

[Josh <josh@foxtail.org>]

Steps to reproduce:

1) put the following text into file `foo' and visit it:
#!/bin/bash

find . \( -name foo -prune \) -o \( -type f -name 'bar*' \) -print0 |
xargs -0 somecmd
echo why is this line indented???
2) C-x h C-M-\
3) Expected behavior: buffer contents would be unchanged
4) Actual behavior: buffer was modified as follows:
#!/bin/bash

find . \( -name foo -prune \) -o \( -type f -name 'bar*' \) -print0 |
xargs -0 somecmd
        echo why is this line indented???


In GNU Emacs 24.3.50.1 (x86_64-apple-darwin, NS apple-appkit-1187.34)
 of 2013-03-04 on bix
Bzr revision: 111935 yamaoka@jpl.org-20130304102733-4qy111z41qwoh2as
Windowing system distributor `Apple', version 10.3.1187
Configured using:
 `configure --host=x86_64-apple-darwin --build=i686-apple-darwin
 --with-ns'

Important settings:
  value of $LC_CTYPE: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t
[...]