Staging: use llseek in all file operations

These could not be detected by the semantic patch.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/staging/msm/mdp4_debugfs.c

@@ -63,13 +63,6 @@ DEFINE_SIMPLE_ATTRIBUTE(
 			"%llx\n");
 
 
-static int mdp4_debugfs_open(struct inode *inode, struct file *file)
-{
-	/* non-seekable */
-	file->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
-	return 0;
-}
-
 static int mdp4_debugfs_release(struct inode *inode, struct file *file)
 {
 	return 0;
@@ -144,10 +137,11 @@ static ssize_t mdp4_debugfs_read(
 }
 
 static const struct file_operations mdp4_debugfs_fops = {
-	.open = mdp4_debugfs_open,
+	.open = nonseekable_open,
 	.release = mdp4_debugfs_release,
 	.read = mdp4_debugfs_read,
 	.write = mdp4_debugfs_write,
+	.llseek = no_llseek,
 };
 
 int mdp4_debugfs_init(void)

drivers/staging/panel/panel.c

@@ -1356,7 +1356,7 @@ static int lcd_open(struct inode *inode, struct file *file)
 		lcd_must_clear = 0;
 	}
 	lcd_open_cnt++;
-	return 0;
+	return nonseekable_open(inode, file);
 }
 
 static int lcd_release(struct inode *inode, struct file *file)
@@ -1369,6 +1369,7 @@ static const struct file_operations lcd_fops = {
 	.write   = lcd_write,
 	.open    = lcd_open,
 	.release = lcd_release,
+	.llseek  = no_llseek,
 };
 
 static struct miscdevice lcd_dev = {