Fix iteration over huge allocations

Huge allocations may have a size that is not a multiple of chunksize.
When stepping through chunks round up the huge allocation size to the
next multiple of chunksize.

Change-Id: I417fdfb840559c2b90c97b0ade7670aa2d181de4
Fixes: 28303511
(cherry picked from commit 1e14731d7182460d082d128660d419b26b9c6c39)
1 file changed