packet: elide two buffer_prepend calls into one

In packet_send2, rather than issue two separate buffer_prepend_data calls
(each of which may entail realloc + memmove + memcpy), elide the prepend
work into a single buffer_prepend_data: the header information is computed
locally, and a single 5 byte prepend operation is now done instead of
prepending 1, then 4 bytes.

Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit aa05248ca81e3bd9e949ad724d45518707446e2c)

Conflicts:
	src/packet.c

0 files changed, 0 insertions, 0 deletions