rpcrt4: Change the test of CStdStubBuffer->pPSFactory to only test for the field not being NULL.

[Rob Shearman]

The address varies on older versions of Windows and isn't really important.
---
 dlls/rpcrt4/tests/cstub.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

See http://test.winehq.org/data/tests/rpcrt4:cstub.html
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