mshtml: Fixed a few coverity issues

[Jacek Caban]

---
 dlls/mshtml/navigate.c   |   16 ++++++++--------
 dlls/mshtml/nsembed.c    |    1 +
 dlls/mshtml/nsio.c       |   12 +++++++++---
 dlls/mshtml/pluginhost.c |    4 +++-
 dlls/mshtml/protocol.c   |    9 +++++++--
 5 files changed, 28 insertions(+), 14 deletions(-)


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