[PATCH v2] selftests/mm/mseal_test: Fix mmap return value check in test_seal_zero_address

[longlong yan]

The return value for a failed mmap function is MAP_FAILED.
According to the definition of FAIL_TEST_IF FALSE,ptr must be
determined to be distinct from MAP_FAILED

Fixes: 4926c7a52de7 ("selftest mm/mseal memory sealing")
Signed-off-by: longlong yan <yanlongl...@kylinos.cn>
---
 tools/testing/selftests/mm/mseal_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/mseal_test.c 
b/tools/testing/selftests/mm/mseal_test.c
index faad4833366a..277c8fda3f5e 100644
--- a/tools/testing/selftests/mm/mseal_test.c
+++ b/tools/testing/selftests/mm/mseal_test.c
@@ -482,7 +482,7 @@ static void test_seal_zero_address(void)
        /* use mmap to change protection. */
        ptr = mmap(0, size, PROT_NONE,
                   MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
-       FAIL_TEST_IF_FALSE(ptr == 0);
+       FAIL_TEST_IF_FALSE(ptr != (void *)-1);
 
        size = get_vma_size(ptr, &prot);
        FAIL_TEST_IF_FALSE(size == 4 * page_size);
-- 
2.43.0