Minor fix to curve_fitting.c
Minor fix to curve_fitting.c

Change-Id: Ib3669a5c4c73178b088dc1e80141f844f807b179

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