Issue #13019: Fix potential reference leaks in bytearray.extend().

Patch by Suman Saha.

diff --cc Misc/NEWS
index 3a4dfe089de3742a22b5c862a8bf8852dea340df,4bf3a916b6ba74625af71712b0c75bcafff3bcc5..12ca91bf175ad692743ac3b8f51fed659c8478ed
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,9 -10,9 +10,12 @@@ What's New in Python 3.3.0 Alpha 2
  Core and Builtins
  -----------------
  
+ - Issue #13019: Fix potential reference leaks in bytearray.extend().  Patch
+   by Suman Saha.
+ 
 +- Issue #1683368: object.__new__ and object.__init__ raise a TypeError if they
 +  are passed arguments and their complementary method is not overridden.
 +
  - Issue #14378: Fix compiling ast.ImportFrom nodes with a "__future__" string as
    the module name that was not interned.
  

diff --cc Objects/bytearrayobject.c
Simple merge