Zero-initialize Jet derivative components.
Zero-initialize Jet derivative components.

Change-Id: I9606aadb1a1f275608f6f332858af9258a120b05

arnaudgelas/ceres-solver,timfel/ceres-bin,timfel/ceres-bin,entylop/ceres-solver,jmwalls/ceres-solver-fork,ysonggit/ceres-solver,timfel/ceres-bin,ikoruk/ceres-solver,jmwalls/ceres-solver-fork,kartikkumar/ceres-solver,ikoruk/ceres-solver,ikoruk/ceres-solver,ysonggit/ceres-solver,whuaegeanse/ceres-solver,arnaudgelas/ceres-solver,ikoruk/ceres-solver,ikoruk/ceres-solver,whuaegeanse/ceres-solver,stonier/ceres_solver,stonier/ceres_solver,jmwalls/ceres-solver-fork,kartikkumar/ceres-solver,entylop/ceres-solver,whuaegeanse/ceres-solver,kartikkumar/ceres-solver,DougFirErickson/ceres-solver,stonier/ceres_solver,stonier/ceres_solver,ysonggit/ceres-solver,ysonggit/ceres-solver,jmwalls/ceres-solver-fork,DougFirErickson/ceres-solver,entylop/ceres-solver,kartikkumar/ceres-solver,arnaudgelas/ceres-solver,DougFirErickson/ceres-solver,entylop/ceres-solver,DougFirErickson/ceres-solver,whuaegeanse/ceres-solver,timfel/ceres-bin