PCI: Validate window resource type in pbus_select_window_for_type()

After ebe091a ("PCI: Use pbus_select_window_for_type() during IO
window sizing") and ae88d0b ("PCI: Use pbus_select_window_for_type()
during mem window sizing"), many bridge windows can't get resources
assigned:

  pci 0006:05:00.0: bridge window [??? 0x00001000-0x00001fff flags 0x20080000]: can't assign; no space
  pci 0006:05:00.0: bridge window [??? 0x00001000-0x00001fff flags 0x20080000]: failed to assign

Those commits replace find_bus_resource_of_type() with
pbus_select_window_for_type(), and the latter lacks resource type
validation.

Add the resource type validation back to pbus_select_window_for_type() to
match the original behavior.

Fixes: 74afce3 ("PCI: Add bridge window selection functions")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=221072
Signed-off-by: Kai-Heng Feng <kaihengf@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://patch.msgid.link/20260210142058.82701-1-kaihengf@nvidia.com

Author: khfeng

drivers/pci/setup-bus.c

@@ -224,14 +224,21 @@ static struct resource *pbus_select_window_for_type(struct pci_bus *bus,
 
 	switch (iores_type) {
 	case IORESOURCE_IO:
-		return pci_bus_resource_n(bus, PCI_BUS_BRIDGE_IO_WINDOW);
+		win = pci_bus_resource_n(bus, PCI_BUS_BRIDGE_IO_WINDOW);
+		if (win && (win->flags & IORESOURCE_IO))
+			return win;
+		return NULL;
 
 	case IORESOURCE_MEM:
 		mmio = pci_bus_resource_n(bus, PCI_BUS_BRIDGE_MEM_WINDOW);
 		mmio_pref = pci_bus_resource_n(bus, PCI_BUS_BRIDGE_PREF_MEM_WINDOW);
 
-		if (!(type & IORESOURCE_PREFETCH) ||
-		    !(mmio_pref->flags & IORESOURCE_MEM))
+		if (mmio && !(mmio->flags & IORESOURCE_MEM))
+			mmio = NULL;
+		if (mmio_pref && !(mmio_pref->flags & IORESOURCE_MEM))
+			mmio_pref = NULL;
+
+		if (!(type & IORESOURCE_PREFETCH) || !mmio_pref)
 			return mmio;
 
 		if ((type & IORESOURCE_MEM_64) ||