[Bug 36139] msi/db test crash on wine compiled with gcc-4.9.0

https://bugs.winehq.org/show_bug.cgi?id=36139

--- Comment #14 from re_nelson  ---
(In reply to Daniel Beitler from comment #7)
> Created attachment 48545 [details]
> Fix for msi get_tablecolumns
>
> Attached a patch that fixes this error for me on gcc-4.9.

I can also confirm the efficacy of the patch. And the correction properly deals
with the change made in GCC-4.9.0, ``Null pointer checks may be optimized away
more aggressively'' shown here:

https://gcc.gnu.org/gcc-4.9/porting_to.html