9570f674cc Avoid passing out-of-bound pointers to 0-size memcpy (Pieter Wuille)
Pull request description:
Doing so could be considered UB in a pedantic interpretation of the standard. Avoid it.
Closes#876.
ACKs for top commit:
practicalswift:
cr ACK 9570f674cc729cafcba65f4cce03552d9a6108f4: patch looks correct
real-or-random:
ACK 9570f674cc
Tree-SHA512: f991462d72e39f14e609021b8427c2e6756009bc8cd21efca2da46ec9410250725a4fed662df20fcdcfd10a4dc59038f13e8c166362b2eadde4366586b9ca72b