tests: fix an fd leak
tests: fix an fd leak

==365== FILE DESCRIPTORS: 6 open (3 std) at exit.
==365== Open AF_UNIX socket 7: <unknown>
==365==    at 0x4A4A8BB: socket (syscall-template.S:120)
==365==    by 0x40597C: util_broker_connect_fd (util-broker.c:558)
==365==    by 0x4033DC: test_fd_stream (test-fdstream.c:235)
==365==    by 0x403599: main (test-fdstream.c:284)
==365==
==365== Open AF_UNIX socket 6: <unknown>
==365==    at 0x4A4A8BB: socket (syscall-template.S:120)
==365==    by 0x40597C: util_broker_connect_fd (util-broker.c:558)
==365==    by 0x4033DC: test_fd_stream (test-fdstream.c:235)
==365==    by 0x403599: main (test-fdstream.c:284)
==365==
==365== Open AF_UNIX socket 5: <unknown>
==365==    at 0x4A4A8BB: socket (syscall-template.S:120)
==365==    by 0x40597C: util_broker_connect_fd (util-broker.c:558)
==365==    by 0x4033DC: test_fd_stream (test-fdstream.c:235)
==365==    by 0x403599: main (test-fdstream.c:284)

Signed-off-by: Evgeny Vereshchagin <a3fde40985401a03951ec31e42775b52b1593ad5@ya.ru>

bus1/dbus-broker