hexl-max-address in hexl-mode is not right

[Ye Wenbin]

The hexl-max-address usually set to buffer-size, but when the buffer  
contain a multiple byte character or the file associated to the buffer is  
encoded by multibyte coding system such as utf-16, the hexl-max-address is  
usually less the the real byte of buffer.

Here is my solution to set hexl-max-address which might help:
(setq hexl-max-address
      (1- (if buffer-file-name
              (nth 7 (file-attributes buffer-file-name))
            (length
             (decode-coding-string (buffer-string)  
buffer-file-coding-system)))))

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