Adding synchronization primitives destroyers

Environment should provide calls for destroying primitives (i.e. env_mutex_destroy()) and OCF should call these functions in its cleanup paths.

Signed-off-by: Firas Medini <mdnfiras@yahoo.com>

src/mngt/ocf_mngt_common.c

@@ -135,6 +135,7 @@ void ocf_mngt_cache_put(ocf_cache_t cache)
 		ctx = cache->owner;
 		ocf_metadata_deinit(cache);
 		ocf_mngt_cache_lock_deinit(cache);
+		env_mutex_destroy(&cache->flush_mutex);
 		env_vfree(cache);
 		ocf_ctx_put(ctx);
 	}