pktcdvd: remove unnecessary debugfs_create_dir() error check

Remove the debugfs_create_dir() error check. It's safe to pass in error
pointers to the debugfs API, hence the user isn't supposed to include
error checking of the return values.
Signed-off-by: Yang Ruibin <11162571@vivo.com>
Link: https://lore.kernel.org/r/20240827022741.3410294-1-11162571@vivo.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/pktcdvd.c

@@ -498,8 +498,6 @@ static void pkt_debugfs_dev_new(struct pktcdvd_device *pd)
 	if (!pkt_debugfs_root)
 		return;
 	pd->dfs_d_root = debugfs_create_dir(pd->disk->disk_name, pkt_debugfs_root);
-	if (!pd->dfs_d_root)
-		return;
 
 	pd->dfs_f_info = debugfs_create_file("info", 0444, pd->dfs_d_root,
 					     pd, &pkt_seq_fops);