[tools] firmware-utils/mkfwimage: fix Ubiquiti firmware generation (closes #4414)

[openwrt.git] / scripts / kconfig.pl

diff --git a/scripts/kconfig.pl b/scripts/kconfig.pl
index 53b8f11..181b35a 100755 (executable)
--- a/scripts/kconfig.pl
+++ b/scripts/kconfig.pl
@@ -72,7 +72,7 @@ sub config_diff($$) {
        my %config;
        
        foreach my $config (keys %$cfg2) {
-               if (!$cfg1->{$config} or $cfg1->{$config} ne $cfg2->{$config}) {
+               if (!defined($cfg1->{$config}) or $cfg1->{$config} ne $cfg2->{$config}) {
                        $config{$config} = $cfg2->{$config};
                }
        }