msi: Prevent call to memset with a nullptr in get_tablecolumns function

[Daniel Beitler]

This is a fix for bug #36139.

It looks like calling memset with a nullptr is undefined behavior. Gcc 
4.9 will actually optimize out the "if(colinfo)" condition if memset was 
called on colinfo before.


---
  dlls/msi/table.c | 7 +++++--
  1 file changed, 5 insertions(+), 2 deletions(-)


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