Fix IO Safety violation for test and sample code

Since rust 1.80 has been released, a runtime failure occurs,
when FD ownership is vailated.
Hence, remove the code which uses invalid FD.

Ref. rust-lang/rust#124210

Signed-off-by: Manabu Sugimoto <[email protected]>

Author: ManaSugi

libseccomp/src/error.rs

@@ -184,15 +184,12 @@ impl SeccompError {
     ///
     /// ```
     /// # use libseccomp::*;
-    /// # use std::os::fd::*;
-    /// let mut ctx = ScmpFilterContext::new(ScmpAction::Allow)?;
-    /// ctx.set_api_sysrawrc(true)?;
-    /// match ctx.export_pfc(unsafe { OwnedFd::from_raw_fd(-2) }) {
+    /// match set_api(1000) {
     ///     Err(e) => {
     ///         eprintln!("Error: {e}");
     ///         if let Some(sys) = e.sysrawrc() {
     ///             eprintln!("The system's raw error code: {sys}");
-    ///             assert_eq!(sys, -libc::EBADF);
+    ///             assert_eq!(sys, -libc::EINVAL);
     ///         }
     ///     }
     ///     _ => println!("No error"),

libseccomp/tests/tests.rs

@@ -1,7 +1,5 @@
 use libseccomp::*;
-use std::fs::File;
 use std::io::{stdout, Error};
-use std::os::unix::io::FromRawFd;
 
 #[cfg(feature = "const-syscall")]
 mod known_syscall_names;
@@ -369,13 +367,9 @@ fn test_precompute() {
 fn test_export_functions() {
     let ctx = ScmpFilterContext::new(ScmpAction::Allow).unwrap();
 
-    let mut invalid_fd: File = unsafe { std::fs::File::from_raw_fd(-2) };
-
     assert!(ctx.export_pfc(stdout()).is_ok());
-    assert!(ctx.export_pfc(&mut invalid_fd).is_err());
 
     assert!(ctx.export_bpf(stdout()).is_ok());
-    assert!(ctx.export_bpf(&mut invalid_fd).is_err());
 
     #[cfg(libseccomp_v2_6)]
     {