Fix #3651  various memory leaks when using the buffer interface

by Amaury Forgeot d'Arc
Reviewer: Antoine Pitrou
diff --git a/Misc/NEWS b/Misc/NEWS
index e001936..3927f9b 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -21,6 +21,10 @@
 
 - Issue #3663: Py_None was decref'd when printing SyntaxErrors.
 
+- Issue #3651: Fix various memory leaks when using the buffer
+  interface, or when the "s#" code of PyArg_ParseTuple is given a
+  bytes object.
+
 - Issue #3657: Fix uninitialized memory read when pickling longs.
   Found by valgrind.