mm/madvise: use vma_lookup() instead of find_vma()

Using vma_lookup() verifies the address is contained in the found vma. 
This results in easier to read the code.

Link: https://lkml.kernel.org/r/20230404094515.1883552-1-zhangpeng362@huawei.com


Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>