BUG/MINOR: h1: fix buffer shift after realignment

Commit 5e74b0b ("MEDIUM: h1: port to new buffer API.") introduced a
minor bug by which a buffer's head could stay shifted by the amount
of removed CRLF if it started with empty lines. This would cause the
second request (or response) not to work until it would receive a few
extra characters. This most only impacts requests sent by hand though.

This is purely 1.9, no backport is needed.
1 file changed