fix intermittend failure of schur_real test: there only is an iterative process if size>2
fix intermittend failure of schur_real test: there only is an iterative process if size>2

pasuka/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,toastedcrumpets/eigen,ritsu1228/eigen,toastedcrumpets/eigen,Zefz/eigen,Zefz/eigen,toastedcrumpets/eigen,ritsu1228/eigen,pasuka/eigen,TSC21/Eigen,ritsu1228/eigen,Zefz/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,TSC21/Eigen,ROCmSoftwarePlatform/hipeigen,TSC21/Eigen,TSC21/Eigen,pasuka/eigen,toastedcrumpets/eigen,pasuka/eigen,Zefz/eigen