msi: Only double the returned size when szValueBuf is NULL

[James Hawkins]

Hi,

The double size 'bug' only happens when the caller requests the size
by sending in a NULL szValueBuf.  The size is correct when filling out
the value.  Verified on native and the Adobe Photoshop Album installer
requires this behavior.  Fixes bug 9946.
http://bugs.winehq.org/show_bug.cgi?id=9946

Changelog:
* Only double the returned size when szValueBuf is NULL.

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

-- 
James Hawkins
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