slimbus: ngd: Fix build error on x86

[ Upstream commit 458a445deb9c9fb13cec46fe9b179a84d2ff514f ]

on non DT platforms like x86 of_match_node is set to NULL, dereferencing
directly would throw an error.
Fix this by doing this in two steps, get the match then the data.
Reported-by: NGreg KH <gregkh@linuxfoundation.org>
Signed-off-by: NSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/slimbus/qcom-ngd-ctrl.c

@@ -1326,11 +1326,12 @@ static int of_qcom_slim_ngd_register(struct device *parent,
 {
 	const struct ngd_reg_offset_data *data;
 	struct qcom_slim_ngd *ngd;
+	const struct of_device_id *match;
 	struct device_node *node;
 	u32 id;
 
-	data = of_match_node(qcom_slim_ngd_dt_match, parent->of_node)->data;
-
+	match = of_match_node(qcom_slim_ngd_dt_match, parent->of_node);
+	data = match->data;
 	for_each_available_child_of_node(parent->of_node, node) {
 		if (of_property_read_u32(node, "reg", &id))
 			continue;