test: remove unused variables in `p2p_invalid_block`

test/functional/p2p_invalid_block.py

@@ -46,12 +46,10 @@ class InvalidBlockRequestTest(BitcoinTestFramework):
 
         self.log.info("Create a new block with an anyone-can-spend coinbase")
 
-        height = 1
         block = create_block(tip, create_coinbase(height), block_time)
         block.solve()
         # Save the coinbase for later
         block1 = block
-        tip = block.sha256
         peer.send_blocks_and_test([block1], node, success=True)
 
         self.log.info("Mature the block.")