convert-modeswitch.pl: fix message indices

[project/usbmode.git] / convert-modeswitch.pl

diff --git a/convert-modeswitch.pl b/convert-modeswitch.pl
index 7b2323b..6930e5f 100755 (executable)
--- a/convert-modeswitch.pl
+++ b/convert-modeswitch.pl
@@ -9,7 +9,7 @@ sub add_message {
        my $msg = shift;
        my $val = $messages{$msg};
 
-       $val or do {
+       defined($val) or do {
                $val = $msg_ctr++;
                $messages{$msg} = $val;
        };