secret: retrieve: Accept AsFd as argument

This is more general. Since BorrowedFd implements AsFd this should not
really break users.

src/desktop/secret.rs

@@ -9,7 +9,7 @@
 //!     let secret = Secret::new().await?;
 //!
 //!     let (mut x1, x2) = std::os::unix::net::UnixStream::pair()?;
-//!     secret.retrieve(&x2.as_fd()).await?;
+//!     secret.retrieve(&x2).await?;
 //!     drop(x2);
 //!     let mut buf = Vec::new();
 //!     x1.read_to_end(&mut buf)?;
@@ -18,7 +18,7 @@
 //! }
 //! ```
 
-use std::os::fd::{AsFd, BorrowedFd};
+use std::os::fd::AsFd;
 
 #[cfg(feature = "async-std")]
 use async_net::{unix::UnixStream, Shutdown};
@@ -68,7 +68,7 @@ impl<'a> Secret<'a> {
     ///
     /// See also [`RetrieveSecret`](https://flatpak.github.io/xdg-desktop-portal/docs/doc-org.freedesktop.portal.Secret.html#org-freedesktop-portal-secret-retrievesecret)
     #[doc(alias = "RetrieveSecret")]
-    pub async fn retrieve(&self, fd: &BorrowedFd<'_>) -> Result<Request<()>, Error> {
+    pub async fn retrieve(&self, fd: &impl AsFd) -> Result<Request<()>, Error> {
         let options = RetrieveOptions::default();
         self.0
             .empty_request(
@@ -98,14 +98,14 @@ pub async fn retrieve() -> Result<Vec<u8>, Error> {
     #[cfg(feature = "tokio")]
     let mut x1 = {
         let (x1, mut x2) = UnixStream::pair()?;
-        proxy.retrieve(&x2.as_fd()).await?;
+        proxy.retrieve(&x2).await?;
         x2.shutdown().await?;
         x1
     };
     #[cfg(feature = "async-std")]
     let mut x1 = {
         let (x1, x2) = UnixStream::pair()?;
-        proxy.retrieve(&x2.as_fd()).await?;
+        proxy.retrieve(&x2).await?;
         x2.shutdown(Shutdown::Both)?;
         x1
     };