mm/mmap: pass vma to vma_merge()

These vma_merge() callers will pass mm, anon_vma and file, they all from
the same vma.  There is no need to pass three parameters at the same time.

Pass vma instead of mm, anon_vma and file to vma_merge(), so that it can
save two parameters.

Link: https://lkml.kernel.org/r/20240203014632.2726545-1-yajun.deng@linux.dev
Link: https://lore.kernel.org/lkml/20240125034922.1004671-2-yajun.deng@linux.dev/


Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>