Input: mark input interfaces as non-seekable

Seeking does not make sense for input interfaces such as evdev and joydev
so let's use nonseekable_open to mark them non-seekable.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 258c639..9f9816b 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -278,6 +278,8 @@
 		goto err_free_client;
 
 	file->private_data = client;
+	nonseekable_open(inode, file);
+
 	return 0;
 
  err_free_client: