Fix leak of objects when reconnecting to QEMU instances

The 'error' cleanup block in qemuProcessReconnect() had a
'return' statement in the middle of it. This caused a leak
of virConnectPtr & virQEMUDriverConfigPtr instances. This
was identified because netcf recently started checking its
refcount in libvirtd shutdown:

netcfStateCleanup:109 : internal error: Attempt to close netcf state driver with open connections
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
(cherry picked from commit 54a24112)

src/qemu/qemu_process.c

@@ -3219,10 +3219,7 @@ error:
         if (!virDomainObjIsActive(obj)) {
             if (virObjectUnref(obj))
                 virObjectUnlock(obj);
-            return;
-        }
-
-        if (virObjectUnref(obj)) {
+        } else if (virObjectUnref(obj)) {
             /* We can't get the monitor back, so must kill the VM
              * to remove danger of it ending up running twice if
              * user tries to start it again later