soundwire: qcom: handle return correctly in qcom_swrm_transport_params

Looks like return from reg_write is set but not checked.
Fix this by adding error return path.
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1503591 ("UNUSED_VALUE")
Fixes: 128eaf93 ("soundwire: qcom: add support to missing transport params")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210401091502.15825-1-srinivas.kandagatla@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/qcom.c

@@ -731,17 +731,23 @@ static int qcom_swrm_transport_params(struct sdw_bus *bus,
 	value |= pcfg->si;
 
 	ret = ctrl->reg_write(ctrl, reg, value);
+	if (ret)
+		goto err;
 
 	if (pcfg->lane_control != SWR_INVALID_PARAM) {
 		reg = SWRM_DP_PORT_CTRL_2_BANK(params->port_num, bank);
 		value = pcfg->lane_control;
 		ret = ctrl->reg_write(ctrl, reg, value);
+		if (ret)
+			goto err;
 	}
 
 	if (pcfg->blk_group_count != SWR_INVALID_PARAM) {
 		reg = SWRM_DP_BLOCK_CTRL2_BANK(params->port_num, bank);
 		value = pcfg->blk_group_count;
 		ret = ctrl->reg_write(ctrl, reg, value);
+		if (ret)
+			goto err;
 	}
 
 	if (pcfg->hstart != SWR_INVALID_PARAM
@@ -755,11 +761,15 @@ static int qcom_swrm_transport_params(struct sdw_bus *bus,
 		ret = ctrl->reg_write(ctrl, reg, value);
 	}
 
+	if (ret)
+		goto err;
+
 	if (pcfg->bp_mode != SWR_INVALID_PARAM) {
 		reg = SWRM_DP_BLOCK_CTRL3_BANK(params->port_num, bank);
 		ret = ctrl->reg_write(ctrl, reg, pcfg->bp_mode);
 	}
 
+err:
 	return ret;
 }