mm/gup: fix handling of errors from arch_make_folio_accessible() in follow_page_pte()

In case we call arch_make_folio_accessible() and it fails, we would
incorrectly return a value that is "!= 0" to the caller, indicating that
we pinned all requested pages and that the caller can keep going.

follow_page_pte() is not supposed to return error values, but instead "0"
on failure and "1" on success -- we'll clean that up separately.

In case we return "!= 0", the caller will just keep going pinning more
pages. If we happen to pin a page afterwards, we're in trouble, because
we essentially skipped some pages in the requested range.

Staring at the arch_make_folio_accessible() implementation on s390x, I
assume it should actually never really fail unless something unexpected
happens (BUG?). So let's not CC stable and just fix common code to do the
right thing.

Clean up the code a bit now that there is no reason to store the return
value of arch_make_folio_accessible().

Link: https://lkml.kernel.org/r/20250908094517.303409-1-david@redhat.com
Fixes: f28d43636d6f ("mm/gup/writeback: add callbacks for inaccessible pages")
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>