Revert commit 2d07449e74 (fixes #100)

src/kv/kv_db.cpp

@@ -873,7 +873,7 @@ static void get_block(kv_db_t *db, uint64_t offset, int cur_level, int recheck_p
         }
         // Block already in cache, we can proceed
         blk->usage = db->usage_counter;
-        db->cli->msgr.ringloop->set_immediate([=] { cb(0, BLK_UPDATING); });
+        cb(0, BLK_UPDATING);
         return;
     }
     cluster_op_t *op = new cluster_op_t;