In ebuild function src_unpack() is called macro 'default', but this for 9999 version does not call git-2_src_unpack. Note also that for git (9999) version flag 'binary' does not have sense, there is no binary to use.
Created attachment 380730 [details, diff] fix unpacking (fetching) source code for git (9999) version of package
should be all set now in the tree; thanks for the report! Commit message: Fix git unpacking http://sources.gentoo.org/sys-firmware/sigrok-firmware-fx2lafw/sigrok-firmware-fx2lafw-0.1.2.ebuild?r1=1.1&r2=1.2 http://sources.gentoo.org/sys-firmware/sigrok-firmware-fx2lafw/sigrok-firmware-fx2lafw-9999.ebuild?r1=1.1&r2=1.2