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rustyrussell tcon: fix warning when it's used with NULL on some gcc versions.

Jan 9, 2023

tcon: fix warning when it's used with NULL on some gcc versions.

Seems to be happening with gcc 12.2.0-3ubuntu1:

```
lightningd/jsonrpc.c: In function ‘destroy_json_command’:
lightningd/jsonrpc.c:1180:63: error: the comparison will always evaluate as ‘false’ for the address of ‘canary’ will never be NULL [-Werror=address]
lightningd/jsonrpc.c:108:53: note: ‘canary’ declared here
```

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

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The C Code Archive Network: http://ccodearchive.net

You can find a set of helper utilities under tools/ and the modules
under ccan/.  The recommended way to add ccan modules to your project
is to create a ccan/ directory and add one module per subdirectory
(see tools/create-ccan-tree).

Enjoy!