msi: Fix several memory leaks after using IEnumSTATSTG_Next.

[Robert Shearman]

The pwcsName field of STATSTG must be freed, otherwise the memory will 
be leaked.
---
  dlls/msi/streams.c |    5 +++++
  dlls/msi/table.c   |    2 ++
  2 files changed, 7 insertions(+), 0 deletions(-)
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