setupapi: fix HeapFree of wrong pointer (found by Smatch).

[Lionel_Debroux]

StringTableInitialize and StringTableInitializeEx free wrong pointer
(NULL) and thus leak some heap memory in error paths. Found in Michael
Stefaniuc's list of potential Wine bugs detected by Smatch.
I had at first misread the code and mistaken the problem for a NOTABUG,
Michael corrected my mistake.

2007-09-06  Lionel Debroux <lionel_debroux at yahoo.fr>
       * dlls/setupapi/stringtable.c:
       setupapi: fix HeapFree of wrong pointer (found by Smatch).



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