ASoC: SOF: debug: use simple_open()

Detected with Coccinelle

sound/soc/sof/debug.c:19:11-28: WARNING opportunity for simple_open,
see also structure on line 82

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

Author: plbossart

sound/soc/sof/debug.c

@@ -16,13 +16,6 @@
 #include <linux/pm_runtime.h>
 #include "sof-priv.h"
 
-static int sof_dfsentry_open(struct inode *inode, struct file *file)
-{
-	file->private_data = inode->i_private;
-
-	return 0;
-}
-
 static ssize_t sof_dfsentry_read(struct file *file, char __user *buffer,
 				 size_t count, loff_t *ppos)
 {
@@ -79,7 +72,7 @@ static ssize_t sof_dfsentry_read(struct file *file, char __user *buffer,
 }
 
 static const struct file_operations sof_dfs_fops = {
-	.open = sof_dfsentry_open,
+	.open = simple_open,
 	.read = sof_dfsentry_read,
 	.llseek = default_llseek,
 };