[CRYPTO]: Do scatterwalk_whichbuf inline.

scatterwalk_whichbuf is called once for each block which could be as
small as 8/16 bytes.  So it makes sense to do that work inline.

It's also a bit inflexible since we may want to use the temporary buffer
even if the block doesn't cross page boundaries.  In particular, we want
to do that when the source and destination are the same.

So let's replace it with scatterwalk_across_pages.

I've also simplified the check in scatterwalk_across_pages.  It is
sufficient to only check len_this_page.

Signed-off-by: David S. Miller <davem@davemloft.net>

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