input/async: check for errors in Seek()

Fixes a busy loop in BufferingInputStream::RunThreadLocked() because
the method never learns that seeking is ignored, even though the HTTP
stream is already broken and can never be read; nobody cared to check
for errors.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1727

NEWS

@@ -12,6 +12,7 @@ ver 0.24 (not yet released)
   - add option to disable archive plugins in mpd.conf
 * input
   - curl: add "connect_timeout" configuration
+  - curl: fix busy loop after connection failed
 * decoder
   - hybrid_dsd: remove
   - opus: implement bitrate calculation

src/input/AsyncInputStream.cxx

@@ -102,9 +102,17 @@ AsyncInputStream::Seek(std::unique_lock<Mutex> &lock,
 	assert(IsReady());
 	assert(seek_state == SeekState::NONE);
 
-	if (new_offset == offset)
+	if (new_offset == offset) {
-		/* no-op */
+		/* no-op, but if the stream is not open anymore (maybe
+		   because it has failed), nothing can be read, so we
+		   should check for errors here instead of pretending
+		   everything's fine */
+
+		if (!open)
+			Check();
+
 		return;
+	}
 
 	if (!IsSeekable())
 		throw std::runtime_error("Not seekable");