make_fit_atf.py and multiple U-Boot ELF segments

Hey all,

As part of reviewing http://patchwork.ozlabs.org/project/uboot/list/?series=187450&state=* I've run in to an odd problem. With patch 4/7 of that series, building firefly-rk3399 fails on the make_fit_atf.py step as those changes end up with a U-Boot ELF that has len(segments) of 2, rather than 1, and the generator blows up. It's not clear to me if we can just check for non-zero number of segments here or what. Thanks!