inout: fixup clippy 1.85 warnings

[baloo]

When clippy runs without block-padding, it will throw warnings:

warning: the following explicit lifetimes could be elided: 'inp, 'out
   --> inout/src/reserved.rs:152:6
    |
152 | impl<'inp, 'out> InOutBufReserved<'inp, 'out, u8> {
    |      ^^^^  ^^^^                   ^^^^  ^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
    = note: `#[warn(clippy::needless_lifetimes)]` on by default
help: elide the lifetimes
    |
152 - impl<'inp, 'out> InOutBufReserved<'inp, 'out, u8> {
152 + impl InOutBufReserved<'_, '_, u8> {