linkfarm-depth: Suppress a spurious warning

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/nailing-cargo b/nailing-cargo
index 240a5a058b8c176e79a8591c5c330d93ce465b1f..ce03c83241232a345593f99122ff83ae09c17424 100755 (executable)
--- a/nailing-cargo
+++ b/nailing-cargo
@@ -592,7 +592,7 @@ sub addargs () {
   $online //= 1 if subcmd_p('online');
   $online //= 0;
 
-  if ($linkfarm_depth eq 'copy-edit-all') {
+  if (($linkfarm_depth//'') eq 'copy-edit-all') {
     $oot_preclean //= 'src';
     if ($oot_preclean !~ m/^(?:src|full)$/) {
       forceable_warning