always close sockets

tcp_syni.nim

@@ -186,7 +186,7 @@ proc doConnect(srcIp: IpAddress, srcPort: Port, dstIp: IpAddress, dstPort: Port,
     future.complete(sock)
   except OSError as e:
     echo &"connection {srcIP}:{srcPort.int} -> {dstIp}:{dstPort.int} failed: ", e.msg
-    discard
+    sock.close()
 
 proc connect*(puncher: TcpSyniPuncher, srcPort: Port, dstIp: IpAddress,
               dstPorts: seq[Port],
@@ -230,7 +230,7 @@ proc prepareAccept(attempt: AcceptAttempt) {.async.} =
       await connectFuture or sleepAsync(Timeout)
       if connectFuture.finished():
         echo "connected during accept phase"
-        sock.close()
+      sock.close()
     except OSError:
       discard