qtest: fix qtest log fd should be initialized before qtest chardev
qtest_log_fp should be inited before qemu_chr_add_handlers. If not the log dumped from callback functions may be lost. easy to reproduce it by command: "QTEST_LOG=1 QTEST_QEMU_BINARY=x86_64-softmmu/qemu-system-x86_64 gtester -k --verbose -m=quick tests/qdev-monitor-test" The log "[I xxxxxx] OPENED" should be printed out by qtest_event, but does not. Signed-off-by: NLi Liu <john.liuli@huawei.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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