HID: wiimote: fix ctx pointer in debugfs DRM-write

single_open() stores the seq_file pointer in file->private_data. It stores
our ctx pointer in seq_file->private.

Signed-off-by: David Herrmann <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

drivers/hid/hid-wiimote-debug.c

···
 static ssize_t wiidebug_drm_write(struct file *f, const char __user *u,
 							size_t s, loff_t *off)
 {
-	struct wiimote_debug *dbg = f->private_data;
+	struct seq_file *sf = f->private_data;
+	struct wiimote_debug *dbg = sf->private;
 	unsigned long flags;
 	char buf[16];
 	ssize_t len;