BUG/MINOR: quic: Missing STREAM frame data pointer updates

This patch follows this one which was not sufficient:
    "BUG/MINOR: quic: Missing STREAM frame length updates"
Indeed, it is not sufficient to update the ->len and ->offset member
of a STREAM frame to move it forward. The data pointer must also be updated.
This is not done by the STREAM frame builder.

Must be backported to 2.6 and 2.7.
2 files changed