Christian Decker 31c67f1392 bcli: Avoid tal_fmt when handling a raw hex block ...

We were using `tal_fmt` to truncate off the last byte of the
response (newline), which required an allocation, a call to `vsnprintf` and a
copy of the block contents. This being >2MB in size on mainnet was rather
expensive.

We now just signal the end of the string by overwriting the trailing newline,
and stealing directly onto the result.

2020-09-02 13:21:32 +02:00

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