mshtml #7: Added generic get_nsinterface function and use it in get_ns_command_state.

[Jacek Caban]

---
 dlls/mshtml/editor.c         |   12 +-----------
 dlls/mshtml/mshtml_private.h |    1 +
 dlls/mshtml/nsembed.c        |   15 +++++++++++++++
 3 files changed, 17 insertions(+), 11 deletions(-)
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