Before the main loop, vma is already is NULL.  There is no need to set it
to NULL again.
Signed-off-by: NChen Gang <gang.chen.5i5j@gmail.com>
Reviewed-by: NOleg Nesterov <oleg@redhat.com>
Acked-by: NDavid Rientjes <rientjes@google.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>