prevent already closed errors

libp2p/stream/chronosstream.nim

@@ -55,9 +55,13 @@ method write*(s: ChronosStream, msg: seq[byte], msglen = -1) {.async, gcsafe.} =
   await s.writer.write(msg, msglen)
 
 method close*(s: ChronosStream) {.async, gcsafe.} =
+  if not s.closed:
+    if not s.reader.closed:
       await s.reader.closeWait()
 
     await s.writer.finish()
+
+    if not s.writer.closed:
       await s.writer.closeWait()
 
     await s.client.closeWait()