server: Reset event in set_registry_notification.

dlls/ntdll/tests/reg.c

@@ -1520,7 +1520,7 @@ static void test_notify(void)
     status = pNtOpenKey(&key, KEY_ALL_ACCESS, &attr);
     ok(status == STATUS_SUCCESS, "NtOpenKey Failed: 0x%08x\n", status);
 
-    event = CreateEventW(NULL, FALSE, FALSE, NULL);
+    event = CreateEventW(NULL, FALSE, TRUE, NULL);
     ok(event != NULL, "CreateEvent failed: %u\n", GetLastError());
 
     status = pNtNotifyChangeKey(key, event, NULL, NULL, &iosb, REG_NOTIFY_CHANGE_NAME, FALSE, NULL, 0, TRUE);

server/registry.c

@@ -2290,7 +2290,10 @@ DECL_HANDLER(set_registry_notification)
                 }
             }
             if (notify)
+            {
+                reset_event( event );
                 set_error( STATUS_PENDING );
+            }
             release_object( event );
         }
         release_object( key );