BUG/MEDIUM: filters: Handle filters registered on data with no payload callback

BUG/MEDIUM: filters: Handle filters registered on data with no payload callback

An HTTP filter with no http_payload callback function may be registered on
data. In that case, this filter is obviously not called when some data are
received but it remains important to update its internal state to be sure to
keep it synchronized on the stream, especially its offet value. Otherwise,
the wrong calculation on the global offset may be performed in
flt_http_end(), leading to an integer overflow when data are moved from
input to output. This overflow triggers a BUG_ON() in c_adv().

The same is true for TCP filters with no tcp_payload callback function.

This patch must be backport to all stable versions.