test_trashcan:  reword obscure code.

Bugfix candidate.
diff --git a/Lib/test/test_gc.py b/Lib/test/test_gc.py
index 33c57ca..22f7e74 100644
--- a/Lib/test/test_gc.py
+++ b/Lib/test/test_gc.py
@@ -188,7 +188,7 @@
 
     gc.enable()
     N = 200
-    for i in range(3):
+    for count in range(3):
         t = []
         for i in range(N):
             t = [t, Ouch()]