devnet: Ensure geth terminates if devnet-allocs fails

bedrock-devnet/devnet/__init__.py

@@ -156,6 +156,7 @@ def devnet_l1_genesis(paths):
         '--rpc.allow-unprotected-txs'
     ])
 
+    try:
         forge = ChildProcess(deploy_contracts, paths)
         forge.start()
         forge.join()
@@ -168,6 +169,7 @@ def devnet_l1_genesis(paths):
         allocs = response['result']
 
         write_json(paths.allocs_path, allocs)
+    finally:
         geth.terminate()