24-1: Fix use-after-free when debug logging read errors (ydb-platform#2816)

Author: snaury

ydb/core/tx/datashard/datashard__read_iterator.cpp

@@ -2490,9 +2490,9 @@ class TDataShard::TTxReadContinue : public NTabletFlatExecutor::TTransactionBase
         if (record.HasStatus()) {
             record.SetSeqNo(state.SeqNo + 1);
             record.SetReadId(readId.ReadId);
-            Self->SendImmediateReadResult(request->Reader, Result.release(), 0, state.SessionId);
             LOG_DEBUG_S(ctx, NKikimrServices::TX_DATASHARD, Self->TabletID() << " read iterator# " << readId
                 << " TTxReadContinue::Execute() finished with error, aborting: " << record.DebugString());
+            Self->SendImmediateReadResult(request->Reader, Result.release(), 0, state.SessionId);
 
             state.Request->ReadSpan.EndError("Finished with error");
             Self->DeleteReadIterator(it);