BUG/MINOR: http-ana: increment internal_errors counter on response error

A bug was introduced in the commit cff0f739e51 ("MINOR: counters: Review
conditions to increment counters from analysers"). The internal_errors
counter for the target server was incremented twice. The counter for the
session listener needs to be incremented instead.

This must be backported everywhere the commit cff0f739e51 is.
1 file changed