fix: fix typo in #1417

qiling/os/os.py

@@ -60,7 +60,7 @@ def __init__(self, ql: Qiling, resolvers: Mapping[Any, Resolver] = {}):
             # for the standard streams which usually do not support certain operations,
             # such as fileno(). here we use this to determine how we are going to use
             # the environment standard streams
-            assert sts.stdin != None # IDAPython don't have corresponding fds
+            assert sys.stdin != None # IDAPython don't have corresponding fds
             sys.stdin.fileno()
         except (UnsupportedOperation, AssertionError):
             # Qiling is used on an interactive shell or embedded python interpreter.