```
make check-source-bolt CHECK_BOLT_PREFIX="--prefix=BOLT-onion-message" BOLTVERSION=guilt/offers
```
Mainly textual, though I neatened the extra fields check for TLVs with
blinding, and implemented the "no other fields" requirement for
non-final onion message hops.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This was reported by @valentinewallace: Dave would only use padding to
make all his own encrypted_recipient_data equal-length. We did it
across the entire path, which includes the hop added by Alice, which
Dave wouldn't know about.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
