pbs-tools::io::pipe: use nix Error type

there's no need to upgrade to anyhow::Error there already

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

pbs-tools/src/io.rs

@@ -1,7 +1,5 @@
 //! I/O utilities.
 
-use anyhow::Error;
-
 use proxmox::tools::fd::Fd;
 
 /// The `BufferedRead` trait provides a single function
@@ -11,12 +9,12 @@ pub trait BufferedRead {
     /// This functions tries to fill the internal buffers, then
     /// returns a reference to the available data. It returns an empty
     /// buffer if `offset` points to the end of the file.
-    fn buffered_read(&mut self, offset: u64) -> Result<&[u8], Error>;
+    fn buffered_read(&mut self, offset: u64) -> Result<&[u8], anyhow::Error>;
 }
 
 /// safe wrapper for `nix::unistd::pipe2` defaulting to `O_CLOEXEC` and guarding the file
 /// descriptors.
-pub fn pipe() -> Result<(Fd, Fd), Error> {
+pub fn pipe() -> Result<(Fd, Fd), nix::Error> {
     let (pin, pout) = nix::unistd::pipe2(nix::fcntl::OFlag::O_CLOEXEC)?;
     Ok((Fd(pin), Fd(pout)))
 }