msi: Fix an off-by-one error

[James Hawkins]

Hi,

This fix gets us to the next bug in bug 5768.
http://bugs.winehq.org/show_bug.cgi?id=5768

Changelog:
* The input buffer length is the number of characters not including
the NULL terminator, so fix an off by one error.

 dlls/msi/install.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

--
James Hawkins
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