Assert that op != NULL in _PyTuple_RESET_HASH_CACHE

Author: mdboom

Include/internal/pycore_tuple.h

@@ -33,7 +33,11 @@ typedef struct {
     PyTupleObject *it_seq; /* Set to NULL when iterator is exhausted */
 } _PyTupleIterObject;
 
-#define _PyTuple_RESET_HASH_CACHE(op) (_PyTuple_CAST(op)->ob_hash = -1)
+#define _PyTuple_RESET_HASH_CACHE(op) \
+    do { \
+        assert(op != NULL); \
+        _PyTuple_CAST(op)->ob_hash = -1; \
+    } while (0)
 
 /*
    bpo-42536: If reusing a tuple object, this should be called to re-track it