Rusty Russell 1741e166a6 lightningd: fix occasional memleak when we detach subd from channel. ...

Do this by setting notleak when we do the detach!

```
**BROKEN** lightningd: MEMLEAK: 0x60f0000bbb38
**BROKEN** lightningd:   label=ccan/ccan/io/io.c:92:struct io_conn
**BROKEN** lightningd:   alloc:
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/ccan/ccan/tal/tal.c:488 (tal_alloc_)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/ccan/ccan/io/io.c:92 (io_new_conn_)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/subd.c:781 (new_subd)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/subd.c:835 (new_channel_subd_)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/channel_control.c:1715 (peer_start_channeld)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/peer_control.c:1390 (connect_activate_subd)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/peer_control.c:1516 (peer_connected_hook_final)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/plugin_hook.c:243 (hook_done)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/plugin_hook.c:343 (plugin_hook_call_next)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/plugin_hook.c:299 (plugin_hook_callback)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/plugin.c:701 (plugin_response_handle)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/plugin.c:790 (plugin_read_json)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/ccan/ccan/io/io.c:60 (next_plan)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/ccan/ccan/io/io.c:422 (do_plan)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/ccan/ccan/io/io.c:439 (io_ready)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/ccan/ccan/io/poll.c:470 (io_loop)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/io_loop_with_timers.c:22 (io_loop_with_timers)
**BROKEN** lightningd:     /home/runner/work/lightning/lightning/lightningd/lightningd.c:1492 (main)
**BROKEN** lightningd:     ../sysdeps/nptl/libc_start_call_main.h:58 (__libc_start_call_main)
**BROKEN** lightningd:     ../csu/libc-start.c:392 (__libc_start_main_impl)
**BROKEN** lightningd:   parents:
**BROKEN** lightningd:     lightningd/lightningd.c:108:struct lightningd
```

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2026-01-08 22:33:19 +10:30

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