mm/msync: use vma_find() instead of vma linked list

Remove a single use of the vma linked list in preparation for the
removal of the linked list. Uses find_vma() to get the next element.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Liam R. Howlett <[e-mail]>
Acked-by: Vlastimil Babka <[e-mail]>
Reviewed-by: Davidlohr Bueso <[e-mail]>
Tested-by: Yu Zhao <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Cc: David Hildenbrand <[e-mail]>
Cc: David Howells <[e-mail]>
Cc: "Matthew Wilcox (Oracle)" <[e-mail]>
Cc: SeongJae Park <[e-mail]>
Cc: Sven Schnelle <[e-mail]>
Cc: Will Deacon <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

mm/msync.c

···
 				error = 0;
 				goto out_unlock;
 			}
-			vma = vma->vm_next;
+			vma = find_vma(mm, vma->vm_end);
 		}
 	}
 out_unlock: