coverity#1078573 Explicit null dereferenced

since...

commit 7581730b2795a58d4fe6868e2f61572a91fde293
Date:   Wed May 23 17:36:44 2018 +0900

    tdf#117247 just send a GRAPHIC_ARRIVED hint after update

Change-Id: Id1a2a3bb25649f3f8e60d7edf79e5fd217b9e72f
Reviewed-on: https://gerrit.libreoffice.org/57736
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/sw/source/core/docnode/swbaslnk.cxx b/sw/source/core/docnode/swbaslnk.cxx
index 5d38d93..27f30ba 100644
--- a/sw/source/core/docnode/swbaslnk.cxx
+++ b/sw/source/core/docnode/swbaslnk.cxx
@@ -173,7 +173,7 @@ static void lcl_CallModify( SwGrfNode& rGrfNd, SfxPoolItem& rItem )
    if ( !bUpdate || bFrameInPaint )
        return SUCCESS;

    if (bUpdate)
    if (bUpdate && pSwGrfNode)
    {
        if (!SetGrfFlySize(aGrfSz, pSwGrfNode, aOldSz))
        {