genblock: no need to use a hashref for redundant domains

Author: maybebyte

genblock

@@ -112,7 +112,7 @@ sub is_domain {
 # Therefore, we can delete advertising.bad-actor.com from the hash.
 sub reduce_domains {
 my $hashref = shift or return;
-my $redundant_domains_hashref;
+my %redundant_domains;
 
 while ( my $domain = each %$hashref ) {
 ## Start with the root domain.
@@ -123,16 +123,16 @@ sub reduce_domains {
 
 if ( defined $hashref->{$leaf} ) {
 delete $hashref->{$domain};
-$redundant_domains_hashref->{$domain} = $leaf;
+$redundant_domains{$domain} = $leaf;
 last;
 }
 
 $index = rindex($domain, '.', $index - 1);
 }
 }
 wantarray
-? return %$redundant_domains_hashref
-: return $redundant_domains_hashref;
+? return %redundant_domains
+: return \%redundant_domains;
 }
 
 sub unique_domains {