fix python bug
diff --git a/python/amcl/mpc.py b/python/amcl/mpc.py
index 7030202..c6f6209 100644
--- a/python/amcl/mpc.py
+++ b/python/amcl/mpc.py
@@ -729,7 +729,5 @@
     # Clear memory
     core_utils.clear_octet(p)
     core_utils.clear_octet(q)
-    core_utils.clear_octet(p2)
-    core_utils.clear_octet(q2)
 
     return p2, q2