util/mkerr.pl: fix perl warning

Gets rid of this;

defined(@array) is deprecated at ../util/mkerr.pl line 792.
        (Maybe you should just omit the defined()?)
defined(@array) is deprecated at ../util/mkerr.pl line 800.
        (Maybe you should just omit the defined()?)
Signed-off-by: NGeoff Thorpe <geoff@openssl.org>

util/mkerr.pl

@@ -789,7 +789,7 @@ foreach (keys %rcodes) {
 	push (@runref, $_) unless exists $urcodes{$_};
 }
 
-if($debug && defined(@funref) ) {
+if($debug && @funref) {
 	print STDERR "The following function codes were not referenced:\n";
 	foreach(sort @funref)
 	{
@@ -797,7 +797,7 @@ if($debug && defined(@funref) ) {
 	}
 }
 
-if($debug && defined(@runref) ) {
+if($debug && @runref) {
 	print STDERR "The following reason codes were not referenced:\n";
 	foreach(sort @runref)
 	{