sqliterator: Use rtl::Reference::get() instead of &*

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

Change-Id: I2361761496648eaaa1e245912ac19aa130b38863
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/211842
Tested-by: Jenkins
Reviewed-by: Neil Roberts <nroberts@libreoffice.org>

connectivity/source/parse/sqliterator.cxx

@@ -769,7 +769,7 @@ void OSQLParseTreeIterator::getColumnRange( const OSQLParseNode* _pColumnRef,
                         OUString& _rTableRange,
                         OUString& _out_rColumnAliasIfPresent ) const
 {
-    lcl_getColumnRange( _pColumnRef, m_pImpl->m_xConnection, _rColumnName, _rTableRange, &*m_aSelectColumns, _out_rColumnAliasIfPresent );
+    lcl_getColumnRange( _pColumnRef, m_pImpl->m_xConnection, _rColumnName, _rTableRange, m_aSelectColumns.get(), _out_rColumnAliasIfPresent );
 }