selftest/s3: prefer empty string over undef to add nothing to config

To fix a warning.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

diff --git a/selftest/target/Samba3.pm b/selftest/target/Samba3.pm
index d7335ac44af6649a21d6fb05e89d3ab86539bfe9..8786b320fa872379e322f009ff7bfdae8355233e 100755 (executable)
--- a/selftest/target/Samba3.pm
+++ b/selftest/target/Samba3.pm
@@ -50,7 +50,7 @@ sub get_fs_specific_conf($$)
                return "vfs objects = $mods";
        }
 
-       return undef;
+       return '';
 }
 
 sub new($$) {