arch/tile: mark "hardwall" device as non-seekable

Arnd's recent patch series tagged this device with noop_llseek,
conservatively.  In fact, it should be no_llseek, which we arrange
for by opening the device with nonseekable_open().

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
diff --git a/arch/tile/kernel/hardwall.c b/arch/tile/kernel/hardwall.c
index 70b829a..e910530 100644
--- a/arch/tile/kernel/hardwall.c
+++ b/arch/tile/kernel/hardwall.c
@@ -768,13 +768,13 @@
 }
 
 static const struct file_operations dev_hardwall_fops = {
+	.open           = nonseekable_open,
 	.unlocked_ioctl = hardwall_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl   = hardwall_compat_ioctl,
 #endif
 	.flush          = hardwall_flush,
 	.release        = hardwall_release,
-	.llseek		= noop_llseek,
 };
 
 static struct cdev hardwall_dev;