If pdata is NULL, atmel_tsadcc_probe() will release all the resources
and return 0, but we need a error code is returned in this case.
Fix to return -EINVAL and move the check for pdata to the begin
of this function.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>