xf86/platform: scan pci after probing devices

This solves a race if we are trying to dynamically power off
secondary GPUs. Its not the greatest fix ever but it probably
as good as we can do for now.

The GPU probing causes the devices to be powered up, then when
we scan the PCI bus we get the correct information from the kernel,
rather than a bunch of 0xff due to the device being powered off.

drop gratuitous '&'.

Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

hw/xfree86/common/xf86platformBus.c

@@ -213,11 +213,12 @@ xf86platformProbe(void)
     int i;
     Bool pci = TRUE;
 
+    config_odev_probe(xf86PlatformDeviceProbe);
+
     if (!xf86scanpci()) {
         pci = FALSE;
     }
 
-    config_odev_probe(&xf86PlatformDeviceProbe);
     for (i = 0; i < xf86_num_platform_devices; i++) {
         char *busid = xf86_get_platform_attrib(i, ODEV_ATTRIB_BUSID);