device property: Make fwnode_graph_for_each_endpoint() consistent

Make fwnode_graph_for_each_endpoint() consistent with the rest of
for_each_*() definitions in the file, i.e. use the form of

	for (iter = func(NULL); iter; \
	     iter = func(iter))

as it's done in all the rest of the similar macro definitions.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20230117152120.42531-1-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/property.h

@@ -436,9 +436,9 @@ fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode,
 unsigned int fwnode_graph_get_endpoint_count(struct fwnode_handle *fwnode,
 					     unsigned long flags);
 
-#define fwnode_graph_for_each_endpoint(fwnode, child)			\
-	for (child = NULL;						\
-	     (child = fwnode_graph_get_next_endpoint(fwnode, child)); )
+#define fwnode_graph_for_each_endpoint(fwnode, child)				\
+	for (child = fwnode_graph_get_next_endpoint(fwnode, NULL); child;	\
+	     child = fwnode_graph_get_next_endpoint(fwnode, child))
 
 int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
 				struct fwnode_endpoint *endpoint);