HSI: omap-ssi: 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 <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/hsi/controllers/omap_ssi_core.c

···
 
 	/* SSI controller */
 	omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL);
-	if (!omap_ssi->dir)
-		return -ENOMEM;
+	debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, &ssi_regs_fops);
 
-	debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi,
-								&ssi_regs_fops);
 	/* SSI GDD (DMA) */
 	dir = debugfs_create_dir("gdd", omap_ssi->dir);
-	if (!dir)
-		goto rback;
 	debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops);
 
 	return 0;
-rback:
-	debugfs_remove_recursive(omap_ssi->dir);
-
-	return -ENOMEM;
 }
 
 static void ssi_debug_remove_ctrl(struct hsi_controller *ssi)