shell32: handle -1 return for GetMenuItemCount in Shell_MergeMenus. (coverity 231) Also include some beginning unit tests for the Shell_MergeMenus.

[Aric Stewart]

---
  dlls/shell32/shlmenu.c         |    3 +
  dlls/shell32/tests/Makefile.in |    1 +
  dlls/shell32/tests/shlmenu.c   |  128 
++++++++++++++++++++++++++++++++++++++++
  3 files changed, 132 insertions(+), 0 deletions(-)
  create mode 100644 dlls/shell32/tests/shlmenu.c


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