Input: bu21013_ts - fix null dereference in error handling

bu21013_data could be NULL so better not reference it.

Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/touchscreen/bu21013_ts.c

···
 err_cs_disable:
 	pdata->cs_dis(pdata->cs_pin);
 err_free_mem:
-	input_free_device(bu21013_data->in_dev);
+	input_free_device(in_dev);
 	kfree(bu21013_data);
 
 	return error;