selftests/nolibc: fix EXPECT_NZ macro

[ Upstream commit 6d33ce36 ]

The expect non-zero macro was incorrect and never used. Fix its
definition.

Fixes: 362aecb2 ("selftests/nolibc: add basic infrastructure to ease creation of nolibc tests")
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://lore.kernel.org/r/20250731201225.323254-2-benjamin@sipsolutions.net


Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>