Appease clippy

[tamird]

See rust-lang/rust#130778.

warning: empty line after doc comment
  --> test/integration-ebpf/build.rs:16:1
   |
16 | / /// [bindeps]: https://doc.rust-lang.org/nightly/cargo/reference/unstable.html?highlight=feature#artifact-dependencies
17 | |
   | |_
18 |   fn main() {
   |   --------- the comment documents this function
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#empty_line_after_doc_comments
   = note: `#[warn(clippy::empty_line_after_doc_comments)]` on by default
   = help: if the empty line is unintentional remove it

error: empty line after doc comment
  --> aya/src/maps/bloom_filter.rs:34:1
   |
34 | / /// ```
35 | |
   | |_
...
38 |   pub struct BloomFilter<T, V: Pod> {
   |   --------------------------------- the comment documents this struct
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#empty_line_after_doc_comments
note: the lint level is defined here
  --> aya/src/lib.rs:41:5
   |
41 |     clippy::all,
   |     ^^^^^^^^^^^
   = note: `#[deny(clippy::empty_line_after_doc_comments)]` implied by `#[deny(clippy::all)]`
   = help: if the empty line is unintentional remove it

error: empty line after doc comment
  --> aya/src/maps/lpm_trie.rs:46:1
   |
46 | / /// ```
47 | |
   | |_
...
50 |   pub struct LpmTrie<T, K, V> {
   |   --------------------------- the comment documents this struct
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#empty_line_after_doc_comments
   = help: if the empty line is unintentional remove it

warning: empty line after doc comment
  --> test/integration-test/build.rs:38:1
   |
38 | / /// [bindeps]: https://doc.rust-lang.org/nightly/cargo/reference/unstable.html?highlight=feature#artifact-dependencies
39 | |
   | |_
40 |   fn main() {
   |   --------- the comment documents this function
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#empty_line_after_doc_comments
   = note: `#[warn(clippy::empty_line_after_doc_comments)]` on by default
   = help: if the empty line is unintentional remove it

warning: calling `CStr::new` with a byte string literal
  --> test/integration-test/src/tests/xdp.rs:45:20
   |
45 |         .from_name(CStr::from_bytes_with_nul(b"lo\0").unwrap())
   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use a `c""` literal: `c"lo"`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_c_str_literals
   = note: `#[warn(clippy::manual_c_str_literals)]` on by default

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