pci: Fix device_find_first_child() return value handling

This function only ever returns 0, but may not assign the second
parameter. Same thing for device_find_next_child(). Do not assign
ret to stop proliferation of this misuse.

Reported-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index 7f3d6dd..0adcdce 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -541,14 +541,13 @@
 	struct pci_child_plat *pplat;
 	unsigned int sub_bus;
 	struct udevice *dev;
-	int ret;
 
 	sub_bus = dev_seq(bus);
 	debug("%s: start\n", __func__);
 	pciauto_config_init(hose);
-	for (ret = device_find_first_child(bus, &dev);
-	     !ret && dev;
-	     ret = device_find_next_child(&dev)) {
+	for (device_find_first_child(bus, &dev);
+	     dev;
+	     device_find_next_child(&dev)) {
 		unsigned int max_bus;
 		int ret;