[PATCH] PCI: fix pci/probe.c possible NULL pointer.

 In drivers/pci/probe.c::pci_scan_bridge() the call for pci_alloc_child_bus()
can return NULL, but it is not handled by the function (detected by
Coverity's checker).

 The patch bellow fix that returning `max' if we got the NULL, but
I do not know if it is right. I guess it is, because in that case
the function will act in the same way as with `pass != 0'.

Signed-off by: Luiz Capitulino <lcapitulino@prefeitura.sp.gov.br>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/pci/probe.c

@@ -366,6 +366,8 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max
 			return max;
 		busnr = (buses >> 8) & 0xFF;
 		child = pci_alloc_child_bus(bus, dev, busnr);
+		if (!child)
+			return max;
 		child->primary = buses & 0xFF;
 		child->subordinate = (buses >> 16) & 0xFF;
 		child->bridge_ctl = bctl;