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/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)