qemu: Need to return status of RNG device removal

Commit id '862473fa' neglected to return the status from the
qemuDomainRemoveRNGDevice call in qemuDomainRemoveDevice causing
the function to always fail when receiving an RNG device unplug
event. Additionally the domain status/state would not be updated
in the processDeviceDeletedEvent path.
Signed-off-by: NLuyao Huang <lhuang@redhat.com>

src/qemu/qemu_hotplug.c

@@ -3271,7 +3271,7 @@ qemuDomainRemoveDevice(virQEMUDriverPtr driver,
         ret = qemuDomainRemoveChrDevice(driver, vm, dev->data.chr);
         break;
     case VIR_DOMAIN_DEVICE_RNG:
-        qemuDomainRemoveRNGDevice(driver, vm, dev->data.rng);
+        ret = qemuDomainRemoveRNGDevice(driver, vm, dev->data.rng);
         break;
 
     case VIR_DOMAIN_DEVICE_MEMORY: