Commit a9089859 ("target/i386/seg_helper: introduce tss_set_busy",
2023-09-26) failed to use the tss_selector argument of the new function,
which was therefore unused.

This shows up as a #GP fault when booting old versions of 32-bit
Linux.

Fixes: a9089859 ("target/i386/seg_helper: introduce tss_set_busy", 2023-09-26)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20231011135350.438492-1-pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>