Fix crash when detaching devices from qemu domains.

Make sure to *not* call qemuDomainPCIAddressReleaseAddr if
QEMUD_CMD_FLAG_DEVICE is *not* set (for older qemu).  This
prevents a crash when trying to do device detachment from
a qemu guest.
Signed-off-by: NChris Lalancette <clalance@redhat.com>

src/qemu/qemu_driver.c

@@ -8567,9 +8567,9 @@ static int qemudDomainDetachPciControllerDevice(struct qemud_driver *driver,
         vm->def->ncontrollers = 0;
     }
 
-    if (qemuDomainPCIAddressReleaseAddr(priv->pciaddrs, &detach->info) < 0) {
+    if ((qemuCmdFlags & QEMUD_CMD_FLAG_DEVICE) &&
+        qemuDomainPCIAddressReleaseAddr(priv->pciaddrs, &detach->info) < 0)
         VIR_WARN0("Unable to release PCI address on controller");
-    }
 
     virDomainControllerDefFree(detach);
 
@@ -8775,9 +8775,9 @@ static int qemudDomainDetachHostPciDevice(struct qemud_driver *driver,
         pciFreeDevice(pci);
     }
 
-    if (qemuDomainPCIAddressReleaseAddr(priv->pciaddrs, &detach->info) < 0) {
+    if ((qemuCmdFlags & QEMUD_CMD_FLAG_DEVICE) &&
+        qemuDomainPCIAddressReleaseAddr(priv->pciaddrs, &detach->info) < 0)
         VIR_WARN0("Unable to release PCI address on controller");
-    }
 
     if (vm->def->nhostdevs > 1) {
         memmove(vm->def->hostdevs + i,