replmd: Refactor adding the backlink in replmd_process_linked_attribute()
The code to add the backlink is the same in both the 'if' and the 'else'
case, so move it outside the if-else block.
(We're going to rework this block of code quite a bit in order to
support single-value linked attribute conflicts, aka bug #13055).
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13055
Signed-off-by: Tim Beale <timbeale@catalyst.net.nz>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>