gh-133581: Fix refleak in t-string AST unparsing (#133724)

diff --git a/Python/ast_unparse.c b/Python/ast_unparse.c
index ae623e0b4171f812c1b51c1d414d4641183f3758..557c12cfda61ff5e9616b2aa06ebbdab9ca42283 100644 (file)
--- a/Python/ast_unparse.c
+++ b/Python/ast_unparse.c
@@ -749,6 +749,7 @@ append_templatestr(PyUnicodeWriter *writer, expr_ty e)
             goto error;
         }
     }
+    _PyArena_Free(arena);
 
     return 0;