Erik Ekman ccfe80c844 sys/shell/gnrc_netif: Allow 'ifconfig help'
Currently a valid netif name must be passed to show the usage
instructions:

```
> ifconfig help
error: invalid interface given
> ifconfig 6 help
usage: ifconfig
usage: ifconfig <if_id> [up|down]
[...]
```

`ifconfig --help` is also accepted.
2021-10-22 14:14:58 +02:00
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