Staging: use llseek in all file operations

These could not be detected by the semantic patch.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c
index 6fa57be..8bd7182 100644
--- a/drivers/staging/panel/panel.c
+++ b/drivers/staging/panel/panel.c
@@ -1356,7 +1356,7 @@
 		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 @@
 	.write   = lcd_write,
 	.open    = lcd_open,
 	.release = lcd_release,
+	.llseek  = no_llseek,
 };
 
 static struct miscdevice lcd_dev = {