Close an object in packed_find_peel

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

src/refs.c

@@ -787,6 +787,8 @@ static int packed_find_peel(reference_oid *ref)
 		 */
 	}
 
+	git_object_close(object);
+
 	return GIT_SUCCESS;
 }