selftests/mm: thp_settings: remove const from return type

selftests/mm: thp_settings: remove const from return type

Patch series "selftest/mm: Remove warnings found by adding compiler flags".

Recently, I reviewed a patch on the mm/kselftest mailing list about a test
which had obvious type mismatch fix in it.  It was strange why that wasn't
caught during development and when patch was accepted.  This led me to
discover that those extra compiler options to catch these warnings aren't
being used.  When I added them, I found tens of warnings in just mm suite.

In this series, I'm fixing those warnings in a few files.  More fixes will
be sent later.

This patch (of 4):

Remove cost from the return type as it is ignored anyways and generates
the warning:

  warning: type qualifiers ignored on function return type [-Wignored-qualifiers]

Link: https://lkml.kernel.org/r/20241209185624.2245158-1-usama.anjum@collabora.com
Link: https://lkml.kernel.org/r/20241209185624.2245158-2-usama.anjum@collabora.com
Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>