remove static variables from atom parser fuzzer

Stdin and Stdout are already synchronized and available to multiple
threads as needed, we don't need to hold onto instances in a static variable.

fuzz/atom/parser/fuzz.rs

@@ -3,26 +3,10 @@
 
 use core::slice;
 use gentoo_utils::{Parseable, atom::Atom};
-use std::{
-    io::{self, Write},
-    sync::{LazyLock, Mutex},
-};
-
-#[derive(Debug)]
-struct State {
-    input: io::Stdin,
-    output: io::Stdout,
-}
+use std::io::{self, Write};
 
 #[unsafe(no_mangle)]
 pub unsafe extern "C" fn LLVMFuzzerTestOneInput(input: *const u8, len: usize) -> i32 {
-    static PIPES: LazyLock<Mutex<State>> = LazyLock::new(|| {
-        Mutex::new(State {
-            input: io::stdin(),
-            output: io::stdout(),
-        })
-    });
-
     let slice = unsafe { slice::from_raw_parts(input, len) };
     let str = str::from_utf8(slice).expect("expected ascii input");
 
@@ -30,13 +14,13 @@ pub unsafe extern "C" fn LLVMFuzzerTestOneInput(input: *const u8, len: usize) ->
         return -1;
     }
 
-    let mut state = PIPES.lock().unwrap();
-
-    writeln!(&mut state.output, "{str}").unwrap();
-
+    let stdin = io::stdin();
+    let mut stdout = io::stdout();
     let mut buffer = String::new();
 
-    state.input.read_line(&mut buffer).unwrap();
+    writeln!(&mut stdout, "{str}").unwrap();
+
+    stdin.read_line(&mut buffer).unwrap();
 
     let control = match buffer.as_str().trim() {
         "0" => Ok(()),