msi [4/4]: Set media info strings to NULL after freeing them

[James Hawkins]

Hi,

These didn't cause any test errors, but they did cause double frees
and possible heap corruption.

Changelog:
* Set media info strings to NULL after freeing them.

 dlls/msi/files.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

-- 
James Hawkins
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