fix a panic problem in syscall/socket.rs #26
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If file is not a Socket type , `file.as_any().downcast_ref::<Socket>()` will return None , so its unwrap() will cause a panic. This patch adds a check to return error when file.as_any().downcast_ref is not a Socket type.
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If file is not a Socket type ,
file.as_any().downcast_ref::<Socket>()will return None , so its unwrap() will cause a panic. This patch adds a check to return error when file.as_any().downcast_ref is not a Socket type.