tests/qtest/migration-test: Don't leak resp in multifd_mapped_ram_fds…

…et_end()

In multifd_mapped_ram_fdset_end() we call qtest_qmp() but forgot
to unref the response QDict we get back, which means it is leaked:

Indirect leak of 4120 byte(s) in 1 object(s) allocated from:
    #0 0x55c0c095d318 in __interceptor_calloc (/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/build/asan/tests/qtest/migration-test+0x22f318) (BuildI
d: 07f667506452d6c467dbc06fd95191966d3e91b4)
    #1 0x7f186f939c50 in g_malloc0 debian/build/deb/../../../glib/gmem.c:161:13
    #2 0x55c0c0ae9b01 in qdict_new qobject/qdict.c:30:13
    #3 0x55c0c0afc16c in parse_object qobject/json-parser.c:317:12
    #4 0x55c0c0afb90f in parse_value qobject/json-parser.c:545:16
    #5 0x55c0c0afb579 in json_parser_parse qobject/json-parser.c:579:14
    #6 0x55c0c0afa21d in json_message_process_token qobject/json-streamer.c:92:12
    #7 0x55c0c0bca2e5 in json_lexer_feed_char qobject/json-lexer.c:313:13
    #8 0x55c0c0bc97ce in json_lexer_feed qobject/json-lexer.c:350:9
    #9 0x55c0c0afabbc in json_message_parser_feed qobject/json-streamer.c:121:5
    #10 0x55c0c09cbd52 in qmp_fd_receive tests/qtest/libqmp.c:86:9
    #11 0x55c0c09be69b in qtest_qmp_receive_dict tests/qtest/libqtest.c:760:12
    #12 0x55c0c09bca77 in qtest_qmp_receive tests/qtest/libqtest.c:741:27
    #13 0x55c0c09bee9d in qtest_vqmp tests/qtest/libqtest.c:812:12
    #14 0x55c0c09bd257 in qtest_qmp tests/qtest/libqtest.c:835:16
    #15 0x55c0c0a87747 in multifd_mapped_ram_fdset_end tests/qtest/migration-test.c:2393:12
    #16 0x55c0c0a85eb3 in test_file_common tests/qtest/migration-test.c:1978:9
    #17 0x55c0c0a746a3 in test_multifd_file_mapped_ram_fdset tests/qtest/migration-test.c:2437:5
    #18 0x55c0c0a93237 in migration_test_wrapper tests/qtest/migration-helpers.c:458:5
    #19 0x7f186f958aed in test_case_run debian/build/deb/../../../glib/gtestutils.c:2930:15
    #20 0x7f186f958aed in g_test_run_suite_internal debian/build/deb/../../../glib/gtestutils.c:3018:16
    #21 0x7f186f95880a in g_test_run_suite_internal debian/build/deb/../../../glib/gtestutils.c:3035:18
    #22 0x7f186f95880a in g_test_run_suite_internal debian/build/deb/../../../glib/gtestutils.c:3035:18
    #23 0x7f186f95880a in g_test_run_suite_internal debian/build/deb/../../../glib/gtestutils.c:3035:18
    #24 0x7f186f95880a in g_test_run_suite_internal debian/build/deb/../../../glib/gtestutils.c:3035:18
    #25 0x7f186f95880a in g_test_run_suite_internal debian/build/deb/../../../glib/gtestutils.c:3035:18
    #26 0x7f186f958faa in g_test_run_suite debian/build/deb/../../../glib/gtestutils.c:3109:18
    #27 0x7f186f959055 in g_test_run debian/build/deb/../../../glib/gtestutils.c:2231:7
    #28 0x7f186f959055 in g_test_run debian/build/deb/../../../glib/gtestutils.c:2218:1
    #29 0x55c0c0a6e427 in main tests/qtest/migration-test.c:4033:11

Unref the object after we've confirmed that it is what we expect.

Signed-off-by: Peter Maydell <[email protected]>
Reviewed-by: Fabiano Rosas <[email protected]>
Signed-off-by: Fabiano Rosas <[email protected]>

tests/qtest/migration-test.c

@@ -2315,6 +2315,7 @@ static void multifd_mapped_ram_fdset_end(QTestState *from, QTestState *to,
     g_assert(qdict_haskey(resp, "return"));
     fdsets = qdict_get_qlist(resp, "return");
     g_assert(fdsets && qlist_empty(fdsets));
+    qobject_unref(resp);
 }
 
 static void *multifd_mapped_ram_fdset_dio(QTestState *from, QTestState *to)