playground refactoring: dgit: Make prep_ud no longer take a directory

Nothing passes this argument, so no functional change.
This will make forthcoming changes more obviously correct.

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

diff --git a/dgit b/dgit
index 827dc62d0c866464b32123a44d92f6a9b78bba16..0809c2906081f74a1e0ce36ccd40d7d4cd0314a9 100755 (executable)
--- a/dgit
+++ b/dgit
@@ -1670,9 +1670,8 @@ our ($dsc_distro, $dsc_hint_tag, $dsc_hint_url);
 
 our $ud = '.git/dgit/unpack';
 
-sub prep_ud (;$) {
-    my ($d) = @_;
-    $d //= $ud;
+sub prep_ud () {
+    my $d = $ud;
     rmtree($d);
     mkpath '.git/dgit';
     mkdir $d or die $!;