BUG/MINOR: tcpcheck: Properly detect pending HTTP data in output buffer

In tcpcheck_eval_send(), the condition to detect there are still pending
data in the output buffer is buggy. Presence of raw data must be tested for
TCP connection only. But a condition on the connection was missing to be
sure it is not an HTX connection.

This patch must be backported as far as 2.2.
1 file changed