[PATCH 3/3] msi: Add a NULL terminator to file->dest after reallocation.

[James Hawkins]

If the size of the buffer is smaller after the reallocation, the
string will not have a NULL terminator within the bounds of the
allocation.

This fixes two valgrind errors of the form:

Invalid read of size 2
    at  strrchrW (unicode.h:264)
    by  move_files_wildcard (action.c:5291)
    by  ITERATE_MoveFiles (action.c:5411)
    by  MSI_IterateRecords (msiquery.c:193)
    by  ACTION_MoveFiles (action.c:5436)
---
 dlls/msi/action.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
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