Cleaner context ref counter

To prevent deinitializing cleaner context (i.e. during switching policy) during
processing requests, access to cleaner should be protected with reference
counter

Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>

src/mngt/ocf_mngt_cache.c

@@ -205,6 +205,8 @@ static ocf_error_t __init_cleaning_policy(ocf_cache_t cache)
 
 	OCF_ASSERT_PLUGGED(cache);
 
+	ocf_refcnt_init(&cache->cleaner.refcnt);
+
 	for (i = 0; i < ocf_cleaning_max; i++)
 		ocf_cleaning_setup(cache, i);