NOMMU: Delete askedalloc and realalloc variables

Delete the askedalloc and realalloc variables as nothing actually uses the
value calculated.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Mike Frysinger <vapier.adi@gmail.com>
Acked-by: Paul Mundt <lethal@linux-sh.org>