mos1...3: logical error-prevent garbage for nlev=3

src/spicelib/devices/mos1/mos1noi.c

@@ -128,6 +128,8 @@ MOS1noise(int mode, int operation, GENmodel * genmodel, CKTcircuit * ckt,
                                 /* linear region */
                                 alpha = 1.0 - (vds*inst->MOS1mode/(model->MOS1type*inst->MOS1vdsat));
                             }
+                        } else {
+                            alpha = 0.0;
                         }
                         beta = inst->MOS1tTransconductance * inst->MOS1m *
                                    inst->MOS1w/(inst->MOS1l - 2 * model->MOS1latDiff);

src/spicelib/devices/mos2/mos2noi.c

@@ -117,6 +117,8 @@ MOS2noise(int mode, int operation, GENmodel * genmodel, CKTcircuit * ckt,
                                 /* linear region */
                                 alpha = 1.0 - (vds*inst->MOS2mode/(model->MOS2type*inst->MOS2vdsat));
                             }
+                        } else {
+                            alpha = 0.0;
                         }
                         beta = inst->MOS2tTransconductance * inst->MOS2m *
                                    inst->MOS2w/(inst->MOS2l - 2 * model->MOS2latDiff);

src/spicelib/devices/mos3/mos3noi.c

@@ -117,6 +117,8 @@ MOS3noise(int mode, int operation, GENmodel * genmodel, CKTcircuit * ckt,
                                 /* linear region */
                                 alpha = 1.0 - (vds*inst->MOS3mode/(model->MOS3type*inst->MOS3vdsat));
                             }
+                        } else {
+                            alpha = 0.0;
                         }
                         beta = inst->MOS3tTransconductance * inst->MOS3m *
                                    inst->MOS3w/(inst->MOS3l - 2 * model->MOS3latDiff);