thunderbolt: test: use NULL macros
Replace the NULL checks with the more specific and idiomatic NULL macros. Acked-by: NMika Westerberg <mika.westerberg@linux.intel.com> Acked-by: NDaniel Latypov <dlatypov@google.com> Signed-off-by: NRicardo Ribalda <ribalda@chromium.org> Acked-by: NBrendan Higgins <brendanhiggins@google.com> Signed-off-by: NShuah Khan <skhan@linuxfoundation.org>
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