PCI: Rename resource variable from r to res

Resource is going to be passed in as argument aften an upcoming change.
Rename the struct resource variable from "r" to "res" to avoid using one
letter variable name in a function argument.

This rename is made separately to reduce churn in the upcoming change.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20250829131113.36754-18-ilpo.jarvinen@linux.intel.com

Author: ij-intel

drivers/pci/setup-bus.c

@@ -1241,32 +1241,32 @@ static bool pbus_upstream_space_available(struct pci_bus *bus, unsigned long mas
 		.align = align,
 	};
 	struct pci_bus *downstream = bus;
-	struct resource *r;
+	struct resource *res;
 
 	while ((bus = bus->parent)) {
 		if (pci_is_root_bus(bus))
 			break;
 
-		pci_bus_for_each_resource(bus, r) {
-			if (!r || !r->parent || (r->flags & mask) != type)
+		pci_bus_for_each_resource(bus, res) {
+			if (!res || !res->parent || (res->flags & mask) != type)
 				continue;
 
-			if (resource_size(r) >= size) {
+			if (resource_size(res) >= size) {
 				struct resource gap = {};
 
-				if (find_resource_space(r, &gap, size, &constraint) == 0) {
+				if (find_resource_space(res, &gap, size, &constraint) == 0) {
 					gap.flags = type;
 					pci_dbg(bus->self,
 						"Assigned bridge window %pR to %pR free space at %pR\n",
-						r, &bus->busn_res, &gap);
+						res, &bus->busn_res, &gap);
 					return true;
 				}
 			}
 
 			if (bus->self) {
 				pci_info(bus->self,
 					 "Assigned bridge window %pR to %pR cannot fit 0x%llx required for %s bridging to %pR\n",
-					 r, &bus->busn_res,
+					 res, &bus->busn_res,
 					 (unsigned long long)size,
 					 pci_name(downstream->self),
 					 &downstream->busn_res);