Commits on Sep 22, 2021

1. Don't close connection if Listen* fails …

   When ListenUDP/ListenPacket fail, the connection is nil and therefore,
   we cannot call `Close()` on it.
   
   Before:
   
   ```
    16:47 CEST ❱ ./goflow-v3.4.2-8-g0c2503d67cc8-linux-x86_64 -kafka=false -nf.port 9995 -nfl=false -sflow=false
   INFO[0000] Starting GoFlow
   INFO[0000] Listening on UDP :9995                        Type=NetFlow
   panic: runtime error: invalid memory address or nil pointer dereference
   [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x7f644a]
   
   goroutine 23 [running]:
   github.com/cloudflare/goflow/v3/utils.UDPRoutine(0x90460d, 0x7, 0xc00021c3c0, 0x1, 0x0, 0x0, 0x270b, 0x0, 0x99b358, 0xc00021a930, ...)
           /home/bernat/code/free/goflow/utils/utils.go:291 +0x140a
   github.com/cloudflare/goflow/v3/utils.(*StateNetFlow).FlowRoutine(0xc000224900, 0x1, 0x0, 0x0, 0x270b, 0x0, 0x2, 0x0)
           /home/bernat/code/free/goflow/utils/netflow.go:358 +0x15c
   main.main.func2(0xc000224900, 0xc00021e260)
           /home/bernat/code/free/goflow/cmd/goflow/goflow.go:134 +0x226
   created by main.main
           /home/bernat/code/free/goflow/cmd/goflow/goflow.go:129 +0x3da
   ```
   
   After:
   
   ```
    16:48 CEST ❱ ./goflow-v3.4.2-8-g0c2503d67cc8-linux-x86_64 -kafka=false -nf.port 9995 -nfl=false -sflow=false
   INFO[0000] Starting GoFlow
   INFO[0000] Listening on UDP :9995                        Type=NetFlow
   FATA[0000] Fatal error: could not listen to UDP (listen udp :9995: bind: address already in use)
   ```

   

   vincentbernat committed Sep 22, 2021
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