dt: protect against NULL matches passed to of_match_node()

There are a few use cases where it is convenient to pass NULL to
of_match_node() and have it fail gracefully. The patch adds a null
check to the beginning so taht it does so.

Signed-off-by: Grant Likely <[e-mail]>

drivers/of/base.c

···
 const struct of_device_id *of_match_node(const struct of_device_id *matches,
 					 const struct device_node *node)
 {
+	if (!matches)
+		return NULL;
+
 	while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
 		int match = 1;
 		if (matches->name[0])