Input: cyttsp4 - leak on error path in probe()

We leak "cd" if the cd->xfer_buf allocation fails.  It was weird to
"goto error_gpio_irq" so I changed the label name.  (Label names should
reflect the label location not the goto location otherwise you get an
"all roads lead to Rome problem").

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>