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ade10e7fc4
We generally hang things off our JSON response (this pattern predates
tmpctx!) but sometimes it gets reported as a memleak. I'd prefer not
to mark JSON responses as "notleak", since they can be allocated for
a while), so use tmpctx here.
```
E ValueError:
E Node errors:
E Global errors:
E - Node /tmp/ltests-spnausnb/test_htlc_out_timeout_1/lightning-1/ has memory leaks: [
E {
E "backtrace": [
E "ccan/ccan/tal/tal.c:442 (tal_alloc_)",
E "ccan/ccan/tal/tal.c:471 (tal_alloc_arr_)",
E "wallet/wallet.c:1775 (wallet_state_change_get)",
E "lightningd/peer_control.c:922 (json_add_channel)",
E "lightningd/peer_control.c:1424 (json_add_peer)",
E "lightningd/peer_control.c:1454 (json_listpeers)",
E "lightningd/jsonrpc.c:643 (command_exec)",
E "lightningd/jsonrpc.c:767 (rpc_command_hook_final)",
E "lightningd/plugin_hook.c:275 (plugin_hook_call_)",
E "lightningd/jsonrpc.c:855 (plugin_hook_call_rpc_command)",
E "lightningd/jsonrpc.c:942 (parse_request)",
E "lightningd/jsonrpc.c:1033 (read_json)",
E "ccan/ccan/io/io.c:59 (next_plan)",
E "ccan/ccan/io/io.c:435 (io_do_always)",
E "ccan/ccan/io/poll.c:300 (handle_always)",
E "ccan/ccan/io/poll.c:377 (io_loop)",
E "lightningd/io_loop_with_timers.c:24 (io_loop_with_timers)",
E "lightningd/lightningd.c:1097 (main)"
E ],
E "label": "wallet/wallet.c:1775:struct state_change_entry[]",
E "parents": [
E "common/json_stream.c:29:struct json_stream",
E "ccan/ccan/io/io.c:91:struct io_conn",
E "lightningd/lightningd.c:116:struct lightningd"
E ],
E "value": "0x55c6b02150b8"
E }
E ]
```
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>