rst alloc: align on reporting cpos too
rst alloc: align on reporting cpos too

Since we align in rst_mem_alloc, we should also align when reporting the
current position; if we don't and things get unlucky, we report a different
position than where the pointer is actually allocated, which fucks things
up quite bad :)

Closes #111

Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

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