Memory: really fix the calculation of PaddedSize
Memory: really fix the calculation of PaddedSize

The calculation of padding isn't really connected to alignment. It's
about filling up the array to contain an integral number of V objects.
Fixed for real now.

Fixes gh-43

Signed-off-by: Matthias Kretz <372ea4eca737a13cd010ee806d4ce7b98ee71550@kde.org>

VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc,chr-engwer/Vc