fix: handle_syscall types differ

[wang-jiahua]

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[Copilot]

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src/syscall.rs:11

• The function now takes a mutable reference to 'tf', yet there is no visible modification to 'tf' in this diff. If the intention is to modify 'tf', ensure that the changes are implemented consistently within the function.

fn handle_syscall(tf: &mut TrapFrame, syscall_num: usize) -> isize {