Remove unnecessary non ASCII characters

This patch eliminates unnecessary non ASCII characters, which led
compilation errors that can be avoided by setting
LC_ALL=en_US.UTF-8.

Change-Id: I1c0d8af66caec04c789c4e523ba4d805686604d3
Signed-off-by: Taku Fukushima <tfukushima@midokura.com>
Merge "Remove unnecessary non ASCII characters"