Cleanup empty event behavior

crates/wasi-common/src/sys/windows/hostcalls_impl/misc.rs

@@ -263,18 +263,9 @@ pub(crate) fn poll_oneoff(
     if fd_events.is_empty() {
         match timeout {
             Some((event, dur)) => return Ok(handle_timeout(event, dur, events)),
-            // `poll` invoked with nfds = 0, timeout = -1 appears to be an infinite sleep on Unix
-            // usually meant to be interrupted by a signal. Unfortunately, WASI doesn't currently
-            // support signals and there is no way to interrupt this infinite sleep, so we
-            // intend to return `ENOTSUP`.
-            //
-            // Unfortunately, current implementation of poll_oneoff on Unix relies on
-            // `poll_oneoff` returning `Ok(())` in such case, so we emulate this behavior for now
-            // and will address it in a subsequent PR.
-            None => {
-                // error!("poll_oneoff: invoking with neither timeout nor fds not supported");
-                return Ok(()); // Err(Error::ENOTSUP);
-            }
+            // The implementation has to return Ok(()) in this case,
+            // cf. the comment in src/hostcalls_impl/misc.rs
+            None => return Ok(()),
         }
     }