BUG/MINOR: quic: retry token remove one useless intermediate expand

According to rfc 5869 about hkdf, extract function returns a
pseudo random key usable to perform expand using labels to derive keys.
So the intermediate expand on a label is useless, the key should be strong
enought using only one expand.

This patch should be backported until v2.6

(cherry picked from commit cc0a4fa0cc9eb7e50a343b20e6bdff7c88f31351)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed