lirc: make chardev nonseekable

There does not seem to be a need for lirc to
allow seeking on the file descriptor, so let's
just disallow this before users start relying
on it.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/media/IR/ir-lirc-codec.c

@@ -235,6 +235,7 @@ static struct file_operations lirc_fops = {
 	.poll		= lirc_dev_fop_poll,
 	.open		= lirc_dev_fop_open,
 	.release	= lirc_dev_fop_close,
+	.llseek		= no_llseek,
 };
 
 static int ir_lirc_register(struct input_dev *input_dev)

drivers/media/IR/lirc_dev.c

@@ -460,6 +460,8 @@ int lirc_dev_fop_open(struct inode *inode, struct file *file)
 
 	mutex_unlock(&lirc_dev_lock);
 
+	nonseekable_open(inode, file);
+
 	return retval;
 }
 EXPORT_SYMBOL(lirc_dev_fop_open);

drivers/staging/lirc/lirc_serial.c

@@ -1058,6 +1058,7 @@ static const struct file_operations lirc_fops = {
 	.poll		= lirc_dev_fop_poll,
 	.open		= lirc_dev_fop_open,
 	.release	= lirc_dev_fop_close,
+	.llseek		= no_llseek,
 };
 
 static struct lirc_driver driver = {

drivers/staging/lirc/lirc_sir.c

@@ -459,6 +459,7 @@ static const struct file_operations lirc_fops = {
 	.unlocked_ioctl	= lirc_ioctl,
 	.open		= lirc_dev_fop_open,
 	.release	= lirc_dev_fop_close,
+	.llseek		= no_llseek,
 };
 
 static int set_use_inc(void *data)