sst: make register_sst_card more self-contained

register_sst_card is used in ASoC code with field `scard_ops` being NULL.
Without this patch, there will be NULL dereference.
Signed-off-by: Lu Guanqun <guanqun.lu@intel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/intel_sst/intel_sst_drv_interface.c

@@ -508,7 +508,6 @@ int register_sst_card(struct intel_sst_card_ops *card)
 			sst_drv_ctx->pmic_state = SND_MAD_INIT_DONE;
 			sst_drv_ctx->rx_time_slot_status = 0; /*default AMIC*/
 			card->pcm_control = sst_pmic_ops.pcm_control;
-			sst_drv_ctx->scard_ops->card_status = SND_CARD_UN_INIT;
 			return 0;
 		} else {
 			pr_err("strcmp fail %s\n", card->module_name);

drivers/staging/intel_sst/intelmid.c

@@ -802,6 +802,7 @@ static int __devinit snd_intelmad_sst_register(
 		pr_err("sst card registration failed\n");
 		return ret_val;
 	}
+	sst_drv_ctx->scard_ops->card_status = SND_CARD_UN_INIT;
 
 	sst_card_vendor_id = intelmaddata->sstdrv_ops->vendor_id;
 	intelmaddata->pmic_status = PMIC_UNINIT;