selftests/mm: fix thuge-gen test bugs

thuge-gen was previously only munmapping part of the mmapped buffer, which
caused us to run out of 1G huge pages for a later part of the test.  Fix
this by munmapping the whole buffer.  Based on the code, it looks like a
typo rather than an intention to keep some of the buffer mapped.

thuge-gen was also calling mmap with SHM_HUGETLB flag (bit 11 set), which
is actually MAP_DENYWRITE in mmap context.  The man page says this flag is
ignored in modern kernels.  I'm pretty sure from the context that the
author intended to pass the MAP_HUGETLB flag so I've fixed that up too.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ryan Roberts <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Cc: Florent Revest <[email protected]>
Cc: Jérôme Glisse <[email protected]>
Cc: John Hubbard <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Peter Xu <[email protected]>
Cc: Shuah Khan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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