Minor cleanup.
diff --git a/Objects/setobject.c b/Objects/setobject.c
index ed588ed..8e56f72 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -963,7 +963,7 @@
         * incrementally resizing as we insert new keys.  Expect
         * that there will be no (or few) overlapping keys.
         */
-        if (dictsize == -1)
+        if (dictsize < 0)
             return -1;
         if ((so->fill + dictsize)*3 >= so->mask*2) {
             if (set_table_resize(so, so->used + dictsize) != 0)
@@ -1457,7 +1457,7 @@
         entry.key = key;
         rv = set_contains_entry(so, &entry);
         Py_DECREF(key);
-        if (rv == -1) {
+        if (rv < 0) {
             Py_DECREF(it);
             return NULL;
         }