ng_pipe: Fix whitespace
Signed-off-by: Martin Vahlensieck <git@academicsolutions.ch>
Reviewed by: markj
MFC after: 2 weeks
Pull Request: https://github.com/freebsd/freebsd-src/pull/1181
(cherry picked from commit 8512311fb5004444f43701eb122b6d77c76d7564)