The logic for the calculation of plld.m is rather complicated, so do a
sanity check that it is non-zero before doing the division.
Change-Id: I60f49b8eed47a3de86713304bde7a4d3f3d935dd
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Found-by: Coverity CID 1260981
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34572
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>