urlmon: Check some of the input parameters to URLOpenStreamA/W & URLOpenBlockingStreamA/W for NULL.

[Robert Shearman]

Add tests for these.
---
  dlls/urlmon/tests/stream.c |    8 ++++++++
  dlls/urlmon/umstream.c     |   15 +++++++++++++++
  2 files changed, 23 insertions(+), 0 deletions(-)
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