fix a few leaks by throwing objects, not newed pointers to objects

src/blockchain_db/blockchain_db.cpp

@@ -197,7 +197,7 @@ uint64_t BlockchainDB::add_block( const block& blk
 {
   // sanity
   if (blk.tx_hashes.size() != txs.size())
-    throw new std::runtime_error("Inconsistent tx/hashes sizes");
+    throw std::runtime_error("Inconsistent tx/hashes sizes");
 
   block_txn_start(false);
 
@@ -283,7 +283,7 @@ block BlockchainDB::get_block_from_height(const uint64_t& height) const
   blobdata bd = get_block_blob_from_height(height);
   block b;
   if (!parse_and_validate_block_from_blob(bd, b))
-    throw new DB_ERROR("Failed to parse block from blob retrieved from the db");
+    throw DB_ERROR("Failed to parse block from blob retrieved from the db");
 
   return b;
 }
@@ -293,7 +293,7 @@ block BlockchainDB::get_block(const crypto::hash& h) const
   blobdata bd = get_block_blob(h);
   block b;
   if (!parse_and_validate_block_from_blob(bd, b))
-    throw new DB_ERROR("Failed to parse block from blob retrieved from the db");
+    throw DB_ERROR("Failed to parse block from blob retrieved from the db");
 
   return b;
 }
@@ -304,7 +304,7 @@ bool BlockchainDB::get_tx(const crypto::hash& h, cryptonote::transaction &tx) co
   if (!get_tx_blob(h, bd))
     return false;
   if (!parse_and_validate_tx_from_blob(bd, tx))
-    throw new DB_ERROR("Failed to parse transaction from blob retrieved from the db");
+    throw DB_ERROR("Failed to parse transaction from blob retrieved from the db");
 
   return true;
 }
@@ -313,7 +313,7 @@ transaction BlockchainDB::get_tx(const crypto::hash& h) const
 {
   transaction tx;
   if (!get_tx(h, tx))
-    throw new TX_DNE(std::string("tx with hash ").append(epee::string_tools::pod_to_hex(h)).append(" not found in db").c_str());
+    throw TX_DNE(std::string("tx with hash ").append(epee::string_tools::pod_to_hex(h)).append(" not found in db").c_str());
   return tx;
 }
 

src/cryptonote_core/blockchain.cpp

@@ -471,7 +471,7 @@ bool Blockchain::deinit()
   // memory operation), otherwise we may cause a loop.
   if (m_db == NULL)
   {
-    throw new DB_ERROR("The db pointer is null in Blockchain, the blockchain may be corrupt!");
+    throw DB_ERROR("The db pointer is null in Blockchain, the blockchain may be corrupt!");
   }
 
   try