kho: fix doc for kho_restore_pages()

This function returns NULL if kho_restore_page() returns NULL, which
happens in a couple of corner cases.  It never returns an error code.

Link: https://lkml.kernel.org/r/20260123190506.1058669-1-tycho@kernel.org
Signed-off-by: Tycho Andersen (AMD) <tycho@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Cc: Alexander Graf <graf@amazon.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: tych0

kernel/liveupdate/kexec_handover.c

@@ -299,7 +299,7 @@ EXPORT_SYMBOL_GPL(kho_restore_folio);
  * Restore a contiguous list of order 0 pages that was preserved with
  * kho_preserve_pages().
  *
- * Return: 0 on success, error code on failure
+ * Return: the first page on success, NULL on failure.
  */
 struct page *kho_restore_pages(phys_addr_t phys, unsigned long nr_pages)
 {