Give ocf_ctx get/put semantics

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>

src/mngt/ocf_mngt_cache.c

@@ -1216,6 +1216,8 @@ static int _ocf_mngt_cache_start(ocf_ctx_t ctx, ocf_cache_t *cache,
 	if (result)
 		goto _cache_mng_init_instance_ERROR;
 
+	ocf_ctx_get(ctx);
+
 	if (params.locked) {
 		/* Increment reference counter to match cache_lock /
 		   cache_unlock convention. User is expected to call

src/mngt/ocf_mngt_common.c

@@ -119,11 +119,15 @@ void cache_mng_core_remove_from_cache(struct ocf_cache *cache, int core_id)
 
 void ocf_mngt_cache_put(ocf_cache_t cache)
 {
+	ocf_ctx_t ctx;
+
 	OCF_CHECK_NULL(cache);
 
 	if (ocf_refcnt_dec(&cache->refcnt.cache) == 0) {
+		ctx = cache->owner;
 		ocf_metadata_deinit(cache);
 		env_vfree(cache);
+		ocf_ctx_put(ctx);
 	}
 }