41295ad602fdffaabacd1e9e99d244ee3992bc28 Minor cleanups in k_order_perturbation DLL.

================================ DYNARE MAKE CHECK MATLAB RESULTS ================================ | TOTAL: 435 | PASS: 429 | FAIL: 4 | XFAIL: 2 | XPASS: 0 | LIST OF FAILED TESTS: | * k_order_perturbation/fs2000k2_use_dll.mod | * k_order_perturbation/fs2000k_1_use_dll.mod | * k_order_perturbation/fs2000k3_use_dll.mod | * kalman_filter_smoother/algoH2.mod

================================ DYNARE MAKE CHECK OCTAVE RESULTS ================================ | TOTAL: 433 | PASS: 431 | FAIL: 0 | XFAIL: 2 | XPASS: 0

A full log can be found on karaba in '/tmp/dynare-master-check-0dBYl48AVu.log'.