tests: avoid littering /tmp

Running 'make -C tests check TESTS=qemuagenttest' left a directory
/tmp/libvirt_XXXXXX/ behind.  The culprit was failure to cleanup
when short-circuiting an expensive test.

* tests/qemuagenttest.c (testQemuAgentTimeout): Free resources
when skipping expensive test.
Signed-off-by: NEric Blake <eblake@redhat.com>

tests/qemuagenttest.c

 /*
- * Copyright (C) 2013 Red Hat, Inc.
+ * Copyright (C) 2013, 2014 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -538,8 +538,10 @@ testQemuAgentTimeout(const void *data)
     if (!test)
         return -1;
 
-    if (virTestGetExpensive() == 0)
-        return EXIT_AM_SKIP;
+    if (virTestGetExpensive() == 0) {
+        ret = EXIT_AM_SKIP;
+        goto cleanup;
+    }
 
     if (qemuMonitorTestAddHandler(test, qemuAgentTimeoutTestMonitorHandler,
                                   NULL, NULL) < 0)