test: remove redundant blocks generation logic

those tests already have enough mature utxos from the pre-mined chain.

test/functional/p2p_leak_tx.py

@@ -4,7 +4,6 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test that we don't leak txs to inbound peers that we haven't yet announced to"""
 
-from test_framework.blocktools import COINBASE_MATURITY
 from test_framework.messages import msg_getdata, CInv, MSG_TX
 from test_framework.p2p import p2p_lock, P2PDataStore
 from test_framework.test_framework import BitcoinTestFramework
@@ -26,9 +25,6 @@ class P2PLeakTxTest(BitcoinTestFramework):
     def run_test(self):
         gen_node = self.nodes[0]  # The block and tx generating node
         miniwallet = MiniWallet(gen_node)
-        # Add enough mature utxos to the wallet, so that all txs spend confirmed coins
-        self.generate(miniwallet, 1)
-        self.generate(gen_node, COINBASE_MATURITY)
 
         inbound_peer = self.nodes[0].add_p2p_connection(P2PNode())  # An "attacking" inbound peer