ole32: Fix circular reference count in default handler objects.

[Rob Shearman]

This is caused by caching a pointer and reference to the data cache's
IPersistStorage interface without managing reference counts
appropriately.
---
 dlls/ole32/defaulthandler.c |   22 ++++++++++++++++++++++
 1 files changed, 22 insertions(+), 0 deletions(-)

Fixes memory leaks in defaulthandler tests. May also fix bugs 12419 & 14863.
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