util: fix removal of callbacks in virCloseCallbacksRun

The close callbacks hash are keyed by a UUID-string, but
virCloseCallbacksRun was attempting to remove them by raw UUID. This
patch ensures the callback entries are removed by UUID-string as well.

This bug caused problems when guest migrations were abnormally aborted:

  # timeout --signal KILL 1 \
      virsh migrate example qemu+tls://remote/system \
        --verbose --compressed --live --auto-converge \
        --abort-on-error --unsafe --persistent \
        --undefinesource --copy-storage-all --xml example.xml
  Killed

  # virsh migrate example qemu+tls://remote/system \
      --verbose --compressed --live --auto-converge \
      --abort-on-error --unsafe --persistent \
      --undefinesource --copy-storage-all --xml example.xml
  error: Requested operation is not valid: domain 'example' is not being migrated
Signed-off-by: NMichael Chapman <mike@very.puzzling.org>

src/util/virclosecallbacks.c

@@ -331,8 +331,9 @@ virCloseCallbacksRun(virCloseCallbacksPtr closeCallbacks,
         return;
 
     for (i = 0; i < list->nentries; i++) {
-        virHashRemoveEntry(closeCallbacks->list,
-                           list->entries[i].uuid);
+        char uuidstr[VIR_UUID_STRING_BUFLEN];
+        virUUIDFormat(list->entries[i].uuid, uuidstr);
+        virHashRemoveEntry(closeCallbacks->list, uuidstr);
     }
     virObjectUnlock(closeCallbacks);