utils: segprint: Fix issue #443 with segprint -b
utils: segprint: Fix issue #443 with segprint -b

Signed-off-by: Tomasz Michalak <a2fdaa543b4cc5e3d6cd8672ec412c0eb393b86e@antmicro.com>

SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray,SymbiFlow/prjxray