msi: Conform to the API spec

[Jeff Latimer]

This patch resolves coverity CID167.  Effectively, szValue can be NULL 
and expects the length of teh required buffer will be returned in 
pcchValue.  The function is stubbed so I have not created a test for this.

Jeff Latimer
---
  dlls/msi/source.c |   18 +++++++++++++-----
  1 files changed, 13 insertions(+), 5 deletions(-)
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