selftests/landlock: Fix missing semicolon

selftests/landlock: Fix missing semicolon

Add missing semicolon after EXPECT_EQ(0, close(stream_server_child)) in
the scoped_vs_unscoped test.  I suspect currently it's just not executing
the close statement after the line, but this causes no observable
difference.

Fixes: fefcf0f7cf47 ("selftests/landlock: Test abstract UNIX socket scoping")
Cc: Tahera Fahimi <fahimitahera@gmail.com>
Signed-off-by: Tingmao Wang <m@maowtm.org>
Link: https://lore.kernel.org/r/d9e968e4cd4ecc9bf487593d7b7220bffbb3b5f5.1766885035.git.m@maowtm.org
Signed-off-by: Mickaël Salaün <mic@digikod.net>