snort3: Active: active.device is mandatory

[Meridoff via Snort-devel <snort-devel () lists snort org>]

Hello, if I not configured active.device we have in Active::open (char
*dev) :

*    if ( dev && strcasecmp(dev, "ip") )*
*    {*
*        s_link = eth_open(dev);*
*...*
So here we trying to eth_open for empty device.

May be change for that if no device specifed - we using "ip":

For example:
*    if ( dev && strlen(dev)  && strcasecmp(dev, "ip") )*
*    {*
*        s_link = eth_open(dev);*

...

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