mm: page_alloc: simplify __free_pages_ok()

There is redundant code in __free_pages_ok(). Use free_one_page()
simplify it.

Link: https://lkml.kernel.org/r/20231216030503.2126130-1-yajun.deng@linux.dev


Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>