inout: fixup clippy 1.85 warnings (#1171)

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> {
```

Author: baloo

inout/src/reserved.rs

@@ -149,9 +149,9 @@ impl<'inp, 'out, T> InOutBufReserved<'inp, 'out, T> {
     }
 }
 
+#[cfg(feature = "block-padding")]
 impl<'inp, 'out> InOutBufReserved<'inp, 'out, u8> {
     /// Transform buffer into [`PaddedInOutBuf`] using padding algorithm `P`.
-    #[cfg(feature = "block-padding")]
     #[inline(always)]
     pub fn into_padded_blocks<P, BS>(self) -> Result<PaddedInOutBuf<'inp, 'out, BS>, PadError>
     where