Simplify nullptr

With 3741b90abe478fb04db88207b496a5238df35bb8 "tdf#138483 sc: update red circles
after merging cells", UBSan builds had started to fail as
CppunitTest_sc_subsequent_filters_test now need ScUndoRemoveMerge RTTI:

> [CUT] sc_subsequent_filters_test
> DynamicLibraryManagerException: "Failed to load dynamic library: workdir/LinkTarget/CppunitTest/libtest_sc_subsequent_filters_test.so
> workdir/LinkTarget/CppunitTest/libtest_sc_subsequent_filters_test.so: undefined symbol: _ZTI17ScUndoRemoveMerge"

But as pUndoRemoveMerge was always empty, we can just as well remove the
variable completely.  (Though I do not know whether pUndoRemoveMerge being empty
is what 3741b90abe478fb04db88207b496a5238df35bb8 had actually intended.)

Change-Id: Ie67dfe3c600ca5a290d091af033a230c581bf3a6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/106963
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

0 files changed, 0 insertions, 0 deletions