msi/tests: Fix a few handle leaks.

[Andrew Nguyen]

This was pointed out by Christoph von Wittich.
---
 dlls/msi/tests/install.c |    1 +
 dlls/msi/tests/msi.c     |    1 +
 dlls/msi/tests/package.c |    1 +
 dlls/msi/tests/source.c  |    1 +
 4 files changed, 4 insertions(+), 0 deletions(-)
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