spi: Remove unneeded OF node NULL checks

In the couple of places the NULL check of OF node is implied by the call
that takes it as a parameter. Drop the respective duplicate checks.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230710154932.68377-2-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi.c

@@ -2399,9 +2399,6 @@ static void of_register_spi_devices(struct spi_controller *ctlr)
 	struct spi_device *spi;
 	struct device_node *nc;
 
-	if (!ctlr->dev.of_node)
-		return;
-
 	for_each_available_child_of_node(ctlr->dev.of_node, nc) {
 		if (of_node_test_and_set_flag(nc, OF_POPULATED))
 			continue;
@@ -3134,7 +3131,7 @@ int spi_register_controller(struct spi_controller *ctlr)
 		if (WARN(id < 0, "couldn't get idr"))
 			return id == -ENOSPC ? -EBUSY : id;
 		ctlr->bus_num = id;
-	} else if (ctlr->dev.of_node) {
+	} else {
 		/* Allocate dynamic bus number using Linux idr */
 		id = of_alias_get_id(ctlr->dev.of_node, "spi");
 		if (id >= 0) {