Broken umlaut in my name, again

On 2009.03.31 17:30:39 +0200, Björn Steinbrink wrote:

While it makes no sense to map some email address to an empty one, doing
things the other way around can be useful. For example when using
filter-branch with an env-filter that employs a mailmap to fix up an
import that created such broken commits with empty email addresses.

Signed-off-by: Björn Steinbrink <redacted>

The umlaut (ö) in my name is broken in the commit that made it into
git.git --> 5288dd58356e53d61e2b3804fc7d8d23c3a46ab3

Last time this happened when I used format-patch -s instead of commit -s
IIRC. But since then, I pay attention to do the sign-off via commit -s,
yet my name is broken again. What did I do wrong this time?

Björn