malloc: Simplify tst-free-errno munmap failure test

The Linux specific test-case in tst-free-errno was backing up malloc
metadata for a large mmap'd block, overwriting the block with its own
mmap, then restoring malloc metadata and calling free to force an munmap
failure.  However, the backed up pages containing metadata can
occasionally be overlapped by the overwriting mmap, leading to a
metadata corruption.

This commit replaces this Linux specific test case with a simpler,
generic, three block allocation, expecting the kernel to coalesce the
VMAs, then cause a fragmentation to trigger the same failure.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

0 files changed, 0 insertions, 0 deletions