ole32: Fix potential NULL dereference of qiresults in ClientIdentity_QueryMultipleInterfaces.

[Robert Shearman]

This could happen if proxy_manager_get_remunknown returns S_FALSE, so 
fix the check of the return code to match that below.
---
  dlls/ole32/marshal.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)
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