SwXCellRange: Use UnoCursorPointer::get() instead of &*

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

Change-Id: I01f77acc36cd1f96c6b438b9d6db005d0b08416a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/211755
Tested-by: Jenkins
Reviewed-by: Neil Roberts <nroberts@libreoffice.org>

sw/source/core/unocore/unotbl.cxx

@@ -3777,7 +3777,7 @@ sal_Int32 SwXCellRange::Impl::GetRowCount() const
 const SwUnoCursor* SwXCellRange::GetTableCursor() const
 {
     SwFrameFormat *const pFormat = m_pImpl->GetFrameFormat();
-    return pFormat ? &(*m_pImpl->m_pTableCursor) : nullptr;
+    return pFormat ? m_pImpl->m_pTableCursor.get() : nullptr;
 }
 
 void SwXCellRange::Impl::Notify( const SfxHint& rHint )