KVM: selftests: Fix kvm_check_cap() assertion

stable inclusion
from stable-5.10.47
commit 4658a8d3079137d8d407892bdc95b390a419c261
bugzilla: 172973 https://gitee.com/openeuler/kernel/issues/I4DAKB

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4658a8d3079137d8d407892bdc95b390a419c261

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

[ Upstream commit d8ac05ea ]

KVM_CHECK_EXTENSION ioctl can return any negative value on error,
and not necessarily -1. Change the assertion to reflect that.
Signed-off-by: NFuad Tabba <tabba@google.com>
Message-Id: <20210615150443.1183365-1-tabba@google.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

tools/testing/selftests/kvm/lib/kvm_util.c

@@ -55,7 +55,7 @@ int kvm_check_cap(long cap)
 		exit(KSFT_SKIP);
 
 	ret = ioctl(kvm_fd, KVM_CHECK_EXTENSION, cap);
-	TEST_ASSERT(ret != -1, "KVM_CHECK_EXTENSION IOCTL failed,\n"
+	TEST_ASSERT(ret >= 0, "KVM_CHECK_EXTENSION IOCTL failed,\n"
 		"  rc: %i errno: %i", ret, errno);
 
 	close(kvm_fd);