yocto-check-layer: Remove duplicated code

Nicolas Dechesne spotted there was duplicate code I had introduced with a
previous fix. Remove the second statement since the earlier one is correct
all that is needed.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>