UPSTREAM: mm/huge_memory.c: fix used-uninitialized

Fix used-uninitialized of `page'.

Fixes: dce7d10b ("mm/madvise: optimize lazyfreeing with mTHP in madvise_free")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202406260514.SLhNM9kQ-lkp@intel.com


Cc: Lance Yang <ioworker0@gmail.com>
Change-Id: I35d79caf4fc6b2cabdcc435b6fa259681d3ee10f
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit d40f74ab)
Bug: 313807618
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>