clippy fix

[termoshtt]

No description provided.

[termoshtt]

error: calling `set_len()` immediately after reserving a buffer creates uninitialized values
Error:    --> lax/src/lib.rs:179:5
    |
179 |     let mut v = Vec::with_capacity(n);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
180 |     v.set_len(n);
    |     ^^^^^^^^^^^^
    |
    = note: `#[deny(clippy::uninit_vec)]` on by default
    = help: initialize the buffer or wrap the content in `MaybeUninit`
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#uninit_vec

Fix this problem should be another PR. This PR only run cargo clippy --fix