BUG/MINOR: log: Detect missing sampling ranges in config

Consider a config like:

    global
    	log 127.0.0.1:10001 sample :10 local0

No sampling ranges are given here, leading to NULL being passed
as the first argument to qsort.

This configuration does not make sense anyway, a log without ranges
would never log. Thus output an error if no ranges are given.

This bug was introduced in d95ea2897eb951c72fd169f36b6a79905f2ed999.
This fix must be backported to HAProxy 2.0.
1 file changed