convert-snort: Fix logic for detecting enough free disk space.

The subfunction only will return something if the check fails - so the logic
of the if statement was wrong set and the downloader only was called if
this check failed and to less diskspace would be available.

Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

config/suricata/convert-snort

@@ -231,6 +231,9 @@ if (-f $snort_rules_tarball) {
 } else {
 	# Check if enought disk space is available.
 	if(&IDS::checkdiskspace()) {
+		# Print error message.
+		print "Could not download ruleset - Not enough free diskspace available.\n";
+	} else {
 		# Call the download function and grab the new ruleset.
 		&IDS::downloadruleset();
 	}