advapi32/CryptDeriveKey: set return key handle to NULL in case of failure

[Michael Jung]

Changelog:
 CryptDeriveKey - set return key handle to NULL in case of failure

-- 
Michael Jung, MSc                        A man alone in the forest talking to
Integrated Circuits and Systems Lab      himself and no woman around to hear 
University of Technology, Darmstadt,DE   him. Is he still wrong? -- Anonymous
phone: +49(6151)16-6692 / email: mjung at iss.tu-darmstadt.de
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