kselftest: arm64: Fix exit code of sve-ptrace

stable inclusion
from stable-5.10.27
commit 6366a5bb888baee5d9f7a5b6168066366e541117
bugzilla: 51493

--------------------------------

[ Upstream commit 07e64488 ]

We track if sve-ptrace encountered a failure in a variable but don't
actually use that value when we exit the program, do so.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210309190304.39169-1-broonie@kernel.org


Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by:   Weilong Chen <chenweilong@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>