Fix #3651  various memory leaks when using the buffer interface

by Amaury Forgeot d'Arc
Reviewer: Antoine Pitrou
diff --git a/Include/object.h b/Include/object.h
index 60584a0..bddfb6f 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -143,7 +143,7 @@
 /* buffer interface */
 typedef struct bufferinfo {
 	void *buf;   
-	PyObject *obj;        /* borrowed reference */
+	PyObject *obj;        /* owned reference */
         Py_ssize_t len;
         Py_ssize_t itemsize;  /* This is Py_ssize_t so it can be 
                                  pointed to by strides in simple case.*/