xmerge: The assigned value is never used

Change-Id: I56ee6583e0e5d82db018b40882a64b0dc00ec90f
Reviewed-on: https://gerrit.libreoffice.org/10575
Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>