wallet2: fix read buffer overflow in import_key_images

src/wallet/wallet2.cpp

@@ -9533,7 +9533,7 @@ uint64_t wallet2::import_key_images(const std::vector<std::pair<crypto::key_imag
   std::unordered_set<crypto::hash> spent_txids;   // For each spent key image, search for a tx in m_transfers that uses it as input.
   std::vector<size_t> swept_transfers;            // If such a spending tx wasn't found in m_transfers, this means the spending tx 
                                                   // was created by sweep_all, so we can't know the spent height and other detailed info.
-  for(size_t i = 0; i < m_transfers.size(); ++i)
+  for(size_t i = 0; i < signed_key_images.size(); ++i)
   {
     transfer_details &td = m_transfers[i];
     uint64_t amount = td.amount();