btrfs: cleanup temporary variables when finding rotational device status

The pointer to struct request_queue is used only to get device type
rotating or the non-rotating. So use it directly.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/volumes.c

@@ -602,7 +602,6 @@ static int btrfs_open_one_device(struct btrfs_fs_devices *fs_devices,
 			struct btrfs_device *device, fmode_t flags,
 			void *holder)
 {
-	struct request_queue *q;
 	struct block_device *bdev;
 	struct btrfs_super_block *disk_super;
 	u64 devid;
@@ -644,8 +643,7 @@ static int btrfs_open_one_device(struct btrfs_fs_devices *fs_devices,
 			set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
 	}
 
-	q = bdev_get_queue(bdev);
-	if (!blk_queue_nonrot(q))
+	if (!blk_queue_nonrot(bdev_get_queue(bdev)))
 		fs_devices->rotating = true;
 
 	device->bdev = bdev;
@@ -2591,7 +2589,6 @@ static int btrfs_finish_sprout(struct btrfs_trans_handle *trans)
 int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path)
 {
 	struct btrfs_root *root = fs_info->dev_root;
-	struct request_queue *q;
 	struct btrfs_trans_handle *trans;
 	struct btrfs_device *device;
 	struct block_device *bdev;
@@ -2667,7 +2664,6 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
 		goto error_free_zone;
 	}
 
-	q = bdev_get_queue(bdev);
 	set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
 	device->generation = trans->transid;
 	device->io_width = fs_info->sectorsize;
@@ -2715,7 +2711,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
 
 	atomic64_add(device->total_bytes, &fs_info->free_chunk_space);
 
-	if (!blk_queue_nonrot(q))
+	if (!blk_queue_nonrot(bdev_get_queue(bdev)))
 		fs_devices->rotating = true;
 
 	orig_super_total_bytes = btrfs_super_total_bytes(fs_info->super_copy);