Input: uinput - mark as non-seekable

Seeking does not make sense for uinput so let's use nonseekable_open
to mark the device non-seekable.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/misc/uinput.c

@@ -290,6 +290,7 @@ static int uinput_open(struct inode *inode, struct file *file)
 	newdev->state = UIST_NEW_DEVICE;
 
 	file->private_data = newdev;
+	nonseekable_open(inode, file);
 
 	return 0;
 }