msi: Fix memory leaks and bad frees.

[Mike McCormack]

---
  dlls/msi/appsearch.c |    4 ++--
  dlls/msi/custom.c    |    3 +++
  dlls/msi/database.c  |    1 +
  3 files changed, 6 insertions(+), 2 deletions(-)
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