gh-94332: make it safe to call assemble_free when assemble_init has not been called...

(cherry picked from commit be82d26570343dafc8a89be5a1a0e2f58d51a904)

diff --git a/Python/compile.c b/Python/compile.c
index 6d800b21c162f9394b3f1b80da3b85a3402cbaf0..70a754b16d8881249be6eec0147fe6d8d96a5a9d 100644 (file)
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -8299,6 +8299,7 @@ assemble(struct compiler *c, int addNone)
     int j, nblocks;
     PyCodeObject *co = NULL;
     PyObject *consts = NULL;
+    memset(&a, 0, sizeof(struct assembler));
 
     /* Make sure every block that falls off the end returns None. */
     if (!c->u->u_curblock->b_return) {