mm/page_owner: fix %pGp format specifier argument type

mm/page_owner: fix %pGp format specifier argument type

The %pGp format specifier expects an argument of type 'unsigned long *',
but page->flags is now of type 'memdesc_flags_t' (a struct containing an
unsigned long member 'f') after the introduction of memdesc_flags_t.

Fix the type mismatch by passing &page->flags.f instead of &page->flags,
which matches the expected type.

Link: https://lore.kernel.org/20260414075813.3425968-1-zhen.ni@easystack.cn
Fixes: 53fbef56e07d ("mm: introduce memdesc_flags_t")
Signed-off-by: Zhen Ni <zhen.ni@easystack.cn>
Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>