mm,hugetlb: drop unlikelys from hugetlb_fault

The unlikely predates an era where we were checking for
hwpoisoned/migration entries prior to checking whether the pte was
present.

Currently, we check for the pte to be a migration/hwpoison entry after we
have checked that is not present, so it must be either one or the other.

Link: https://lkml.kernel.org/r/20250627102904.107202-6-osalvador@suse.de
Link: https://lkml.kernel.org/r/20250630144212.156938-6-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Gavin Guo <gavinguo@igalia.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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