Fix deref before None check in http pool

snf-common/synnefo/lib/pool/http.py

@@ -37,7 +37,7 @@ from select import select
 from httplib import (
     HTTPConnection as http_class,
     HTTPSConnection as https_class,
-    ResponseNotReady
+    ResponseNotReady,
 )
 
 from new import instancemethod
@@ -106,10 +106,10 @@ class HTTPConnectionPool(ObjectPool):
         # The association is broken by put_http_connection(), to prevent
         # a connection object from being returned to the pool twice,
         # on duplicate invocations of conn.close().
-        if not conn._pool:
-            conn._pool = self
         if conn is None:
             return False
+        if not conn._pool:
+            conn._pool = self
         sock = conn.sock
         if sock is None:
             return True