scan cifs: fix passing "no pass" parameter

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

PVE/Storage.pm

@@ -1196,9 +1196,9 @@ sub scan_cifs {
 
     # we only support Windows 2012 and newer, so just use smb3
     my $cmd = ['/usr/bin/smbclient', '-m', 'smb3', '-d', '0', '-L', $server];
-    push @$cmd, '-N' if !defined($user);
     push @$cmd, '-W', $domain if defined($domain);
 
+    push @$cmd, '-N' if !defined($password);
     local $ENV{USER} = $user if defined($user);
     local $ENV{PASSWD} = $password if defined($password);