[msi] initialize variable to placate static analyzers

[Dan Kegel]

Avoids the spurious compiler warning

msi.c: In function 'MSI_ApplyPatchW':
msi.c:353:10: error: 'r' may be used uninitialized in this function

Hans says "It's compiler confusion but I'm fine with a patch that initializes
r with ERROR_FUNCTION_FAILED."
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