pci-devfn: check that device/slot number is within range

Need to check that guest slot/device number is not > 31 or walk off
the devfn table when checking if a devfn is available or not in a guest.

before this fix, passing in an addr=abc  or addr=34,
can crash qemu, sometimes fail gracefully if data past end
of devfn table fails the availability test.

with this fix, get clean error:
Property 'pci-assign.addr' doesn't take value '34'

also tested when no addr= param passed for guest (pcicfg) address,
and that worked as well.
Signed-off-by: NDon Dutile <ddutile@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/qdev-properties.c

@@ -524,6 +524,8 @@ static int parse_pci_devfn(DeviceState *dev, Property *prop, const char *str)
         return -EINVAL;
     if (fn > 7)
         return -EINVAL;
+    if (slot > 31)
+        return -EINVAL;
     *ptr = slot << 3 | fn;
     return 0;
 }