exif --remove not idempotent, and a Debian man page bug

[Emanuel Berg <incal@dataswamp.org>]

>From IRC ...

    <incal> vengeance, you the exif(1) guy here, right, how
            can it be it isn't idempotent? I just run it for
            every jpg on the HDD and after done, it does the
            same thing again upon a 2nd invocation
            
    <incal> I'll mail Lutz Mueller <lutz@users.sourceforge.net> as well

    <incal> for f in **/*.jpg; do exif --remove -o $f $f; done | grep 'Wrote
            file' | wc -l # 2277 (1st invocation)
            
    <incal> for f in **/*.jpg; do exif --remove -o $f $f; done | grep 'Wrote
            file' | wc -l # 2277 (2nd invocation)
            
    <incal> ??
    
    <incal> ah that mail is 550
    
    <incal> unknown user
    
    <incal> let's post it on gmane.linux.debian.user then ...
    
    <incal> Debian should remove that from the man page then, i.e. exif(1)

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