fusion: improve UninstallAssembly stub slightly, fix typo in test

[Dan Kegel]

Improve stub slightly so callers (like our test) looking for a
disposition find one.
Also fix a minor typo in the test.

Fixes Valgrind warning:
 Conditional jump or move depends on uninitialised value(s)
    at  winetest_ok (test.h:244)
    by  func_asmcache (asmcache.c:925)
    by  run_test (test.h:414)
    by  main (test.h:463)
  Uninitialised value was created by a stack allocation
    at  func_asmcache (asmcache.c:941)
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