Fix an uninitialized variable warning when building with GCC.
Fix an uninitialized variable warning when building with GCC.

Change-Id: I6f24553a9c4dfb59e05778f19406aefa058b6342

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