media: staging: media: imx: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Steve Longerbeam <slongerbeam@gmail.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: devel@driverdev.osuosl.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/imx/imx7-mipi-csis.c

@@ -1017,33 +1017,14 @@ static int mipi_csis_dump_regs_show(struct seq_file *m, void *private)
 }
 DEFINE_SHOW_ATTRIBUTE(mipi_csis_dump_regs);
 
-static int mipi_csis_debugfs_init(struct csi_state *state)
+static void mipi_csis_debugfs_init(struct csi_state *state)
 {
-	struct dentry *d;
-
-	if (!debugfs_initialized())
-		return -ENODEV;
-
 	state->debugfs_root = debugfs_create_dir(dev_name(state->dev), NULL);
-	if (!state->debugfs_root)
-		return -ENOMEM;
-
-	d = debugfs_create_bool("debug_enable", 0600, state->debugfs_root,
-				&state->debug);
-	if (!d)
-		goto remove_debugfs;
-
-	d = debugfs_create_file("dump_regs", 0600, state->debugfs_root,
-				state, &mipi_csis_dump_regs_fops);
-	if (!d)
-		goto remove_debugfs;
-
-	return 0;
-
-remove_debugfs:
-	debugfs_remove_recursive(state->debugfs_root);
 
-	return -ENOMEM;
+	debugfs_create_bool("debug_enable", 0600, state->debugfs_root,
+			    &state->debug);
+	debugfs_create_file("dump_regs", 0600, state->debugfs_root, state,
+			    &mipi_csis_dump_regs_fops);
 }
 
 static void mipi_csis_debugfs_exit(struct csi_state *state)