pseudo: Simplify pseudo_client_ignore_path_chroot()

This also plugs a memory leak in pseudo_client_ignore_path_chroot().

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit d8dddd50)
Signed-off-by: Steve Sakoman <steve@sakoman.com>