virHostdevPreparePCIDevices: Construct pcidevs list earlier

There's no need to translate virDomainHostdevDef-s into
virPCIDevice-s with locked list of PCI devices.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/util/virhostdev.c

@@ -639,12 +639,12 @@ virHostdevPreparePCIDevices(virHostdevManagerPtr mgr,
     if (!nhostdevs)
         return 0;
 
+    if (!(pcidevs = virHostdevGetPCIHostDeviceList(hostdevs, nhostdevs)))
+        return -1;
+
     virObjectLock(mgr->activePCIHostdevs);
     virObjectLock(mgr->inactivePCIHostdevs);
 
-    if (!(pcidevs = virHostdevGetPCIHostDeviceList(hostdevs, nhostdevs)))
-        goto cleanup;
-
     /* Detaching devices from the host involves several steps; each
      * of them is described at length below.
      *
@@ -912,9 +912,9 @@ virHostdevPreparePCIDevices(virHostdevManagerPtr mgr,
     }
 
  cleanup:
-    virObjectUnref(pcidevs);
     virObjectUnlock(mgr->activePCIHostdevs);
     virObjectUnlock(mgr->inactivePCIHostdevs);
+    virObjectUnref(pcidevs);
 
     return ret;
 }