Fix uninitialized variable warning in SparseQR
Fix uninitialized variable warning in SparseQR

--HG--
branch : vladimir_ch/fix-uninitialized-variable-warning-in-sp-1408513228472

rotorliu/eigen,rotorliu/eigen,mjbshaw/Eigen,madlib/eigen_backup,madlib/eigen_backup,madlib/eigen_backup,rotorliu/eigen,mjbshaw/Eigen,madlib/eigen_backup,rotorliu/eigen,mjbshaw/Eigen,mjbshaw/Eigen