[PATCH for v4.9 LTS 79/87] nbd: blk_mq_init_queue returns an error code on failure, not NULL

From: Jeff Moyer [ Upstream commit 25b4acfc7de0fc4da3bfea3a316f7282c6fbde81 ] Additionally, don't assign directly to disk->queue, otherwise blk_put_queue (called via put_disk) will choke (panic) on the errno stored there. Bug found by code inspection after Omar found a

[PATCH for v4.9 LTS 79/87] nbd: blk_mq_init_queue returns an error code on failure, not NULL

From: Jeff Moyer [ Upstream commit 25b4acfc7de0fc4da3bfea3a316f7282c6fbde81 ] Additionally, don't assign directly to disk->queue, otherwise blk_put_queue (called via put_disk) will choke (panic) on the errno stored there. Bug found by code inspection after Omar found a similar issue in