This was changing all the time when I tried to make
autogenerate-rpc-examples.py reproducible. Turns out it was being
corrupted (it does suspicious things with pointers); rather than try
to diagnose it, I simply rewrote the code to create it only when we
need it.
```
Valgrind error file: valgrind-errors.34506
==34506== Uninitialised byte(s) found during client check request
==34506== at 0x241732: memcheck_ (mem.h:247)
==34506== by 0x2417BC: towire (towire.c:17)
==34506== by 0x24185C: towire_u16 (towire.c:28)
==34506== by 0x20C8E4: towire_tlv_scb_tlvs_remote_to_self_delay (scb_wiregen.c:213)
==34506== by 0x240E78: towire_tlv (tlvstream.c:342)
==34506== by 0x20C99F: towire_tlv_scb_tlvs (scb_wiregen.c:234)
==34506== by 0x20C298: towire_modern_scb_chan (scb_wiregen.c:89)
==34506== by 0x1A6CF3: json_add_scb (peer_control.c:2488)
==34506== by 0x1A6E0C: json_staticbackup (peer_control.c:2519)
==34506== by 0x177E3F: command_exec (jsonrpc.c:799)
==34506== by 0x1785AE: rpc_command_hook_final (jsonrpc.c:945)
==34506== by 0x1BEC2D: plugin_hook_call_next (plugin_hook.c:199)
==34506== Address 0x1ffeffe736 is on thread 1's stack
==34506== in frame #2, created by towire_u16 (towire.c:26)
==34506==
{
<insert_a_suppression_name_here>
Memcheck:User
fun:memcheck_
fun:towire
fun:towire_u16
fun:towire_tlv_scb_tlvs_remote_to_self_delay
fun:towire_tlv
fun:towire_tlv_scb_tlvs
fun:towire_modern_scb_chan
fun:json_add_scb
fun:json_staticbackup
fun:command_exec
fun:rpc_command_hook_final
fun:plugin_hook_call_next
}
==34506== Uninitialised byte(s) found during client check request
==34506== at 0x241732: memcheck_ (mem.h:247)
==34506== by 0x2417BC: towire (towire.c:17)
==34506== by 0x240EF0: towire_tlv (tlvstream.c:354)
==34506== by 0x20C99F: towire_tlv_scb_tlvs (scb_wiregen.c:234)
==34506== by 0x20C298: towire_modern_scb_chan (scb_wiregen.c:89)
==34506== by 0x1A6CF3: json_add_scb (peer_control.c:2488)
==34506== by 0x1A6E0C: json_staticbackup (peer_control.c:2519)
==34506== by 0x177E3F: command_exec (jsonrpc.c:799)
==34506== by 0x1785AE: rpc_command_hook_final (jsonrpc.c:945)
==34506== by 0x1BEC2D: plugin_hook_call_next (plugin_hook.c:199)
==34506== by 0x1BEBA8: plugin_hook_callback (plugin_hook.c:186)
==34506== by 0x1B771E: plugin_response_handle (plugin.c:705)
==34506== Address 0x7bd1d08 is 40 bytes inside a block of size 42 alloc'd
==34506== at 0x484DCD3: realloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==34506== by 0x3C8614: tal_resize_ (tal.c:755)
==34506== by 0x2417A2: towire (towire.c:14)
==34506== by 0x24185C: towire_u16 (towire.c:28)
==34506== by 0x20C8E4: towire_tlv_scb_tlvs_remote_to_self_delay (scb_wiregen.c:213)
==34506== by 0x240E78: towire_tlv (tlvstream.c:342)
==34506== by 0x20C99F: towire_tlv_scb_tlvs (scb_wiregen.c:234)
==34506== by 0x20C298: towire_modern_scb_chan (scb_wiregen.c:89)
==34506== by 0x1A6CF3: json_add_scb (peer_control.c:2488)
==34506== by 0x1A6E0C: json_staticbackup (peer_control.c:2519)
==34506== by 0x177E3F: command_exec (jsonrpc.c:799)
==34506== by 0x1785AE: rpc_command_hook_final (jsonrpc.c:945)
==34506==
```
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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