cid#1472783 avoid null pointer dereference

The target was created, but the pointer was not updated.

Change-Id: I2e19ae3c84769de493f712f3189a2a506f173c0f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/110476
Tested-by: Jenkins
Reviewed-by: Regina Henschel <rb.henschel@t-online.de>
diff --git a/sc/source/core/data/drwlayer.cxx b/sc/source/core/data/drwlayer.cxx
index 63d4cb8..c7d2ad4 100644
--- a/sc/source/core/data/drwlayer.cxx
+++ b/sc/source/core/data/drwlayer.cxx
@@ -2014,6 +2014,8 @@ void ScDrawLayer::MirrorRTL( SdrObject* pObj )
                              *pDoc, pData->maStart.Tab());
                aNoRotateAnchor.mbResizeWithCell = pData->mbResizeWithCell;
                SetNonRotatedAnchor(*pObj, aNoRotateAnchor);
                pNoRotatedAnchor = GetNonRotatedObjData(pObj);
                assert(pNoRotatedAnchor);
            }
            // Mirror object at vertical axis
            Point aRef1( 0, 0 );