BUG/MINOR: ssl: use atomic ops to update global shctx stats

The global shctx lookups and misses was updated without using atomic
ops, so the stats available in "show info" are very likely off by a few
units over time. This should be backported as far as 1.8. Versions
without _HA_ATOMIC_INC() can use HA_ATOMIC_ADD(,1).
1 file changed