Rollup merge of rust-lang#146432 - hermit-os:hermit-take_error, r=joboet

Implement `Socket::take_error` for Hermit

This PR fixes an unused-imports compilation error introduced in 845311a and implements `Socket::take_error` for Hermit.

Hermit's `Socket::take_error` implementation works exactly like the one for Unix.

r? joboet

Author: Zalathar

library/std/src/sys/net/connection/socket/hermit.rs

@@ -304,7 +304,8 @@ impl Socket {
     }
 
     pub fn take_error(&self) -> io::Result<Option<io::Error>> {
-        unimplemented!()
+        let raw: c_int = getsockopt(self, libc::SOL_SOCKET, libc::SO_ERROR)?;
+        if raw == 0 { Ok(None) } else { Ok(Some(io::Error::from_raw_os_error(raw as i32))) }
     }
 
     // This is used by sys_common code to abstract over Windows and Unix.

library/std/src/sys/pal/hermit/os.rs

@@ -3,7 +3,7 @@ use crate::ffi::{OsStr, OsString};
 use crate::marker::PhantomData;
 use crate::path::{self, PathBuf};
 use crate::sys::unsupported;
-use crate::{fmt, io, str};
+use crate::{fmt, io};
 
 pub fn errno() -> i32 {
     unsafe { hermit_abi::get_errno() }