getword(), (s < x) ==> (s - 1 < x - 1)

src/frontend/numparam/xpressn.c

@@ -1321,7 +1321,7 @@ getword(const char *s, const char * const s_end, SPICE_DSTRINGPTR tstr_p)
 /* isolate a word from s after position "after". return i= last read+1 */
 {
     s++;
-    while ((s < s_end) && !alfa(s[-1]))
+    while ((s-1 < s_end - 1) && !alfa(s[-1]))
         s++;
 
     spice_dstring_reinit(tstr_p);