bug#21180: 25.0.50; Occur mode is confused about what it's searching for (lots of binary cruft)

[Dima Kogan]

Hi. I found a bug in a very recent build of emacs (bd3b426; HEAD as of
2015/08/02). Recipe:

1. emacs -Q
2. Move point to start of buffer
3. C-s C-w C-w C-w (search for the bit of text at the start)
4. M-s o (launch occur mode to find all matches). Result:

     1 match for "<lots of binary>" in buffer: *scratch*
           1:;; This buffer is for notes you don't want to save, and for Lisp 
evaluation.

The "<lots of binary>" thing is wrong.