linkdlg: Use SvRef::get() instead of &*

Using &* can be problematic if the pointer is null. In this case it
probably doesn’t matter, but using SvRef::get() is probably easier to
understand anyway. This also paves the way for a later compiler plugin
to check for this.

Change-Id: I26aa62d78454d11c9912bdd3e9ab9db2d93293a7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/211847
Reviewed-by: Neil Roberts <nroberts@libreoffice.org>
Tested-by: Jenkins

cui/source/dialogs/linkdlg.cxx

@@ -481,7 +481,7 @@ IMPL_LINK( SvBaseLinksDlg, EndEditHdl, sfx2::SvBaseLink&, _rLink, void )
     // edited link needs to be refreshed.
     bool bLinkFnd = false;
     for( size_t n = pLinkMgr->GetLinks().size(); n;  )
-        if( &_rLink == &(*pLinkMgr->GetLinks()[ --n ]) )
+        if( &_rLink == pLinkMgr->GetLinks()[ --n ].get() )
         {
             bLinkFnd = true;
             break;