mm: use mapping_mapped to simplify the code

mm: use mapping_mapped to simplify the code

Use mapping_mapped() to simplify the code, make the code tidy and clean.

Link: https://lore.kernel.org/20260612073032.33228-1-huangsj@hygon.cn
Signed-off-by: Huang Shijie <huangsj@hygon.cn>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Reviewed-by: Oscar Salvador (SUSE) <osalvador@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>