Need to check the FWs number limit several times. So pack the duplicated steps into a function. And do it before access the new entry. Change-Id: I71117d1c817c0b6ddaea4ea47aea91672cc6d55a Signed-off-by: Zheng Bao <fishbaozi@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/58764 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Felix Held <felix-coreboot@felixheld.de>