ocfs2/dlm: replace __get_free_page() with kmalloc()

ocfs2/dlm: replace __get_free_page() with kmalloc()

A few places in ocsfs2 allocate temporary buffers with __get_free_page() or
get_zeroed_page().

kmalloc() is a better API for such use and it also provides better
scalability and more debugging possibilities.

Replace use of __get_free_page() and get_zeroed_page() with kmalloc() and
kzalloc() respectively.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Link: https://patch.msgid.link/20260523-b4-fs-v1-3-275e36a83f0e@kernel.org
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>