mm/mprotect: fix obsolete function name in change_pte_range()

Since commit 79a1971c ("mm: move the copy_one_pte() pte_present check
into the caller"), the explanation of preserving soft-dirtiness is moved
into copy_nonpresent_pte().  Update corresponding comment.

Link: https://lkml.kernel.org/r/20230723033114.3224409-1-linmiaohe@huawei.comSigned-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/mprotect.c

@@ -213,7 +213,7 @@ static long change_pte_range(struct mmu_gather *tlb,
 			} else if (is_writable_device_private_entry(entry)) {
 				/*
 				 * We do not preserve soft-dirtiness. See
-				 * copy_one_pte() for explanation.
+				 * copy_nonpresent_pte() for explanation.
 				 */
 				entry = make_readable_device_private_entry(
 							swp_offset(entry));