Fix a bug: do not read in front of string s by s[-1].

Still needs more checking: we remmove and add 'params:'?

src/frontend/inpcom.c

@@ -3645,10 +3645,11 @@ static char *inp_fix_subckt(struct names *subckt_w_params, char *s)
     char *equal, *beg, *buffer, *ptr1, *ptr2, *new_str;
 
     equal = strchr(s, '=');
-    if (equal &&
-        (!strstr(s, "params:") || !isspace_c(s[-1]))) {
-        /* get subckt name (ptr1 will point to name) */
+    if (equal) {
+        char* paramstr = strstr(s, "params:");
+        if (!paramstr || !isspace_c(paramstr[-1])) {
 
+            /* get subckt name (ptr1 will point to name) */
             ptr1 = skip_token(s);
             for (ptr2 = ptr1; *ptr2 && !isspace_c(*ptr2) && !isquote(*ptr2);
                 ptr2++)
@@ -3714,6 +3715,7 @@ static char *inp_fix_subckt(struct names *subckt_w_params, char *s)
 
             s = buffer;
         }
+    }
 
     return s;
 }