return (); 
(the empty array) makes the code a bit more readable.

> Gesendet: Montag, 12. Februar 2018 um 23:19 Uhr
> Von: "Bernhard Held" <berny156(a)gmx.de>
> An: development(a)lists.ipfire.org
> Betreff: [PATCH v2 2/4] Network::network2bin: return an empty list in case of error
>
> 'return undef;' will always return a single value 'undef' even in list context.
> 
> sub foo { return undef }
> if ( my @x = foo() ) {
>     print "oops, we think we got a result";
> }
> ---
>  config/cfgroot/network-functions.pl | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/config/cfgroot/network-functions.pl b/config/cfgroot/network-functions.pl
> index 93bb646a6..41d36a194 100644
> --- a/config/cfgroot/network-functions.pl
> +++ b/config/cfgroot/network-functions.pl
> @@ -139,7 +139,7 @@ sub network2bin($) {
>  	my $netmask_bin = &ip2bin($netmask);
>  
>  	if (!defined $address_bin || !defined $netmask_bin) {
> -		return undef;
> +		return;
>  	}
>  
>  	my $network_start = $address_bin & $netmask_bin;
> -- 
> 2.16.1
> 
>