Prevent buffer overflow, remove unused

src/xspice/icm/analog/pwlts/cfunc.mod

@@ -155,9 +155,6 @@ void cm_pwlts(ARGS)  /* structure holding parms,
     double test1;           /* debug testing value */
     double test2;           /* debug testing value */
     double *last_x_value;   /* static variable for limiting */
-    double test;            /* temp storage variable for limit testing */
-
-    Mif_Complex_t ac_gain;
 
     CALLBACK = cm_pwlts_callback;
 
@@ -283,7 +280,7 @@ void cm_pwlts(ARGS)  /* structure holding parms,
                /*** must determine position progressively & then  ***/
                /*** calculate required output.                    ***/
 
-            for (i=1; i<size; i++) {
+            for (i = 1; i < size - 1; i++) {
 
                 if (x_input < (x[i] + x[i+1])/2.0) {
                                    /* approximate position known...          */