Fixed resizestring() to work if reference tracing is turned on.

The realloc() call would move the list head without fixing the
pointers to in the the chain of allocated objects...

Objects/stringobject.c

@@ -296,24 +296,31 @@ resizestring(pv, newsize)
 	object **pv;
 	int newsize;
 {
-	register stringobject *v;
-	v = (stringobject *) *pv;
+	register object *v;
+	register stringobject *sv;
+	v = *pv;
 	if (!is_stringobject(v) || v->ob_refcnt != 1) {
 		*pv = 0;
 		DECREF(v);
 		err_badcall();
 		return -1;
 	}
+	/* XXX UNREF/NEWREF interface should be more symmetrical */
+#ifdef TRACE_REFS
+	--ref_total;
+#endif
+	UNREF(v);
 	*pv = (object *)
 		realloc((char *)v,
 			sizeof(stringobject) + newsize * sizeof(char));
 	if (*pv == NULL) {
-		DECREF(v);
+		DEL(v);
 		err_nomem();
 		return -1;
 	}
-	v = (stringobject *) *pv;
-	v->ob_size = newsize;
-	v->ob_sval[newsize] = '\0';
+	NEWREF(*pv);
+	sv = (stringobject *) *pv;
+	sv->ob_size = newsize;
+	sv->ob_sval[newsize] = '\0';
 	return 0;
 }