oeqa/selftest/resulttooltests: fix minor typo

Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 80cfa56d)
Signed-off-by: Steve Sakoman <steve@sakoman.com>