xmerge: The assigned value is never used

Change-Id: I0476332d43138f3403b85d7ce14f4e27376adc0c
Reviewed-on: https://gerrit.libreoffice.org/10688
Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>