contrib/dracut: fix syntax error in module-setup.sh
The dracut/02zfsexpandknowledge/module-setup.sh.in has a syntax error
which makes the script unusable by a POSIX compliant shell like Dash
on Debian based systems.
Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Aron Xu <happyaron.xu@gmail.com>
Closes #5712