lib: Throw an error when ramdisk is present but initrd.size is 0

It fails if you call extract() when ramdisk is present but initrd
size is 0. This CL adds if-statement to throw an error when initrd
size is 0.

Change-Id: I85aa33d2c2846b6b3a58df834dda18c47433257d
Signed-off-by: Asami Doi <d0iasm.pub@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34535
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Martin Roth <martinroth@google.com>

0 files changed, 0 insertions, 0 deletions