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>