Minor beautification.  Put updates and declarations in a more logical order.
diff --git a/Objects/setobject.c b/Objects/setobject.c
index 017fcd8..22d9cb3 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -60,8 +60,8 @@
     size_t perturb = hash;
     size_t mask = so->mask;
     size_t i = (size_t)hash; /* Unsigned for defined overflow behavior. */
-    int cmp;
     size_t j;
+    int cmp;
 
     entry = &table[i & mask];
     if (entry->key == NULL)
@@ -211,9 +211,9 @@
         i = i * 5 + 1 + perturb;
     }
   found_null:
-    so->fill++;
     entry->key = key;
     entry->hash = hash;
+    so->fill++;
     so->used++;
 }